Life-stage guide
Maintenance routine, stocking changes and long-term water quality.
Pale trailing faeces in a fish is an intestinal mucus cast, and the fish's appetite is what splits the causes. This guide separates an empty gut from internal flagellates, Camallanus worms, bacterial enteritis, constipation and water quality damage, explains why medication in the water cannot reach a parasite in the in
Fish do not swallow chlorine, they breathe it across a gill only a few cells thick. This guide explains why free chlorine and chloramine behave differently, why the standing-bucket remedy fails, how to dose for the full tank volume, and why the filter dies at the same time as the fish are injured.
Light is the accelerator and CO2 is the fuel in a planted tank. How to set a photoperiod that matches your carbon supply, run injected CO2 safely, and read algae as feedback that light and CO2 are out of balance.
Nearly every lump or spot on a fish resembles several others, and their treatments are incompatible. This guide separates white spot, breeding tubercles, velvet, fungus, columnaris, epistylis, lymphocystis, ulcers, visible parasites and tumours, explains why the water test comes first, and shows how to photograph and l
Fin rot is an opportunistic bacterial infection of damaged fin tissue, and it is driven by water quality far more than by the bacteria themselves. This guide separates the ragged, discoloured, advancing edge of true fin rot from the clean-edged bites of fin nipping, covers the look-alikes including columnaris and funga
Atypical mycobacteria live in aquarium biofilm, cause a slow untreatable wasting disease in fish, and cause a skin infection in people that is routinely diagnosed months late. This guide covers the pattern that identifies mycobacteriosis in a tank and the differentials for a wasting or bent-spined fish, what fish tank
A shrimp must build a new shell, split the old one behind the head and back out. When that fails the shrimp dies within a day. This guide explains the three phases of a moult and how each one fails, how to tell a shed shell from a dead shrimp, why large water changes and evaporation top-ups are the leading trigger, and
Fish do not grow to the size of the tank; a small tank produces a stunted, deformed, shorter-lived animal. Covers the species that outgrow home aquaria, the rehoming routes that actually work, transport and acclimation, honest disclosure of aggression and disease, and why release into any natural water is never accepta
Fish do not play bite and there is no escalation ladder to correct. Nipping is territorial, competitive, or caused by too small a group. This guide explains the four real causes, what healthy interaction looks like, and how to change the tank so the biting stops.
Fish cannot be smelled for dental disease. They replace teeth throughout life, have no gum line and no tartar, and must never be lifted from the water. Odour still matters, but it belongs to the tank. This guide explains what mouth problems fish really get and how to read a change in tank smell.
The commonest way to lose fish during a holiday is overfeeding by a well-meaning helper, not starvation, because healthy adult fish tolerate a short fast far better than a fouled tank. This guide covers when fasting is the safe choice and which fish cannot be left, why plaster holiday blocks are harmful, how automatic
Appetite loss in fish is checked in a fixed order: water, then temperature, then environment, then the food itself, and disease last. This guide explains why ammonia suppresses feeding before anything else is visible, how food fails to reach bottom and nocturnal feeders in a competitive tank, how to wean a wild-caught
Almost all of an aquarium is harmless to people, and the risk that exists concentrates in one place: broken skin in warm water. This guide covers fish tank granuloma and why it is missed for weeks, the fast marine wound infections that behave in the opposite way, the palytoxin hazard in reef tanks, and how to divide ta
Fish have no claws and do not scratch furniture. The real problem is the furniture inside the tank. This guide covers testing decor for sharp edges, trap risks, intake guards, and how a mechanical fin tear turns into fin rot.
A fish that spins, corkscrews or shivers in place is showing a neurological sign, and in a home aquarium the cause is far more often the water or the temperature than the brain. This guide covers why ammonia reaches fish brain tissue directly, the swim bladder to inner ear link that makes goldfish spin, the full differ
Fish have no nails and nothing that needs trimming. The handling task that really causes bleeding is catching and moving a fish. This guide covers container capture, soft nets, protecting the slime coat, and the infections that show up days after a rough transfer.
Fish do not eat houseplants, so the plant risks that matter in an aquarium are different. This guide covers why terrestrial plants sold as aquatic rot and raise ammonia, why fertilisers and pesticides are the real toxicity risk, and how to grow houseplants above the water line safely.
Overfeeding is the most common mistake in fishkeeping and it damages fish twice: once through the food itself, and again through the water quality collapse that follows. Fish beg constantly because foraging is what they do, not because they are hungry. Here is how to judge a portion, feed bottom dwellers properly, and
Most aquarium fish eat one manufactured food for years, so what is on the label accumulates. This guide explains what crude protein really measures and why it cannot tell krill from feather meal, how to read an ingredient list including split plant entries, why the form of vitamin C is the single most useful line on th
Most aquarium fish that die at home were already in trouble when they were bought, or were the wrong species for the tank before it was filled. This covers why the shop's shared plumbing matters more than the individual fish, the head-to-tail check you can do through the glass, the feeding test that beats every other t
Fish vets exist and diagnose by microscope, not by guesswork, which is why a live fish gives an answer and one found dead usually does not. How to find an aquatic practice in your region, transport a fish safely, what the appointment involves from skin scrape to culture, and why dosing the tank first destroys the diagn
GH builds shells, KH holds pH steady, and TDS is a summary reading that cannot tell you what changed. This guide separates the three, explains why Neocaridina and Caridina need different water, and shows why a fast correction kills more shrimp than the wrong reading did.
Dwarf shrimplets hatch as miniature adults and graze biofilm from every surface, which is why they survive in mature tanks and vanish in clean new ones. This guide covers building grazing surface, feeding the tank rather than the shrimp, failed moults, and the copper products that kill invertebrates outright.
Fish do not form attachment bonds and cannot get separation anxiety, so alone training does not exist for them. What looks like distress is water quality, stocking, or tank design. This guide explains the myth, what fish really need company for, and what to do before a trip.
A fish cannot be dehydrated and cannot be encouraged to drink. What it does manage constantly is the flow of water and salts across its gills. This guide explains hardness, buffering, and why choosing species that suit your tap water beats chemical adjustment.
A thin fish is a symptom, not a diagnosis. How to recognise an underweight fish, work out whether the cause is competition, poor food, parasites, disease or temperature, and rebuild condition by getting the right food to the right fish.
Bloodworm, brine shrimp and freeze-dried foods are supplements, not diets, and the harm they do is nutritional, microbiological and chemical. This guide covers what each supplementary food actually contributes, why rich protein is dangerous for herbivorous cichlids, how to thaw and rinse frozen food without polluting t
The visible white grains are the parasite at its most protected, buried under the fish's own tissue, and only the free-swimming stage can be killed. This guide explains the three-stage life cycle and why the course must outlast the last spot, how to calculate the real water volume, why carbon must come out, which fish,
Fish losses cluster into four seasonal patterns with mechanisms you can act on. Explains why warm water holds less oxygen while demand rises, why spring kills more pond fish than winter through the gap between pathogen growth and fish immunity, why ice must never be broken by striking, how to feed by water temperature,
Digging in aquarium fish is usually feeding, breeding or shelter building rather than destruction, and a sifter that stops digging is more worrying than one that never stops. The real hazards are rockwork undermined from below, which collapses onto fish or glass, and substrate chosen for looks that erodes barbels or lo
In an overheated tank the fish are suffocating rather than cooking: warm water holds less oxygen exactly as the fish need more. This guide gives the order of actions, starting with aeration and unplugging a suspect heater, explains why ice and large cold water changes kill, covers the dawn oxygen crash that catches pon
Swelling in a fish is a sign with many causes, and the view from directly above separates them: lifted scales mean fluid accumulation and a poor outlook, while flat scales open a much better list. This guide covers overfeeding, constipation in deep-bodied goldfish, pregnancy in livebearers, egg retention, internal para
Fish detect a storm through their whole body, and some species hear far better than others, but the noise is rarely what harms them. Oxygen, temperature, rain chemistry and power failure are the real risks, and jumping is the main injury. This guide covers the mechanisms and a practical plan for a noisy night or an out
Fish absorb calcium directly from the water at the gills, so hardness matters more than any supplement and there is no fish equivalent of reptile UVB. What food must supply is phosphorus and vitamins, and vitamin C degrades fast in stale flake. This guide covers that, and works through what a bent spine really means, f
Garden ponds are visited by herons, cats and other predators, and an unprotected pond can be emptied in a season. This guide explains why physical exclusion beats deterrents, what a well-protected pond looks like, and how to care for a fish that survived a strike.
Fish are not dewormed on a mammalian calendar, and blanket dosing a healthy tank does harm. Real prevention is quarantining every new fish, plant and snail, keeping tanks biologically separate, and keeping fish healthy enough to resist.
A fish cannot leave a hot tank, and warm water holds less oxygen just as the fish needs more. This guide covers surface gasping, heater failure, summer sun, and how to cool a tank without causing a second emergency.
Fat and fluid look similar through the glass and mean very different things. This guide shows how to assess body shape from above, separates obesity from dropsy, gravidity, constipation and internal masses, explains why overfeeding produces fatty liver in fish, covers the species differences that change the diet comple
Fish store surplus energy around the organs and inside the liver, and in a small body cavity that fat presses on the gut and the swim bladder. This guide covers judging condition from above, the species most at risk, why stale food damages the liver, and why a fat fish must never be crash dieted.
Fish medication is dosed by water volume, not body weight, and the water is also a living filter. This guide covers measuring the real volume, removing carbon, protecting oxygen levels, running a hospital tank, when salt and heat are appropriate, and the situations where medication is the wrong answer entirely.
More aquarium fish are killed by treatment than by the disease that prompted it. This guide covers measuring the tank's true water volume rather than its printed capacity, removing carbon so the dose is not stripped out, raising aeration because most treatments lower dissolved oxygen, and the species and systems that n
Fish rest at night without closing their eyes, and they need a predictable dark period to do it. This guide explains photoperiod, normal resting postures by species group, the early morning oxygen dip, and how to set a lighting routine that stops night-time panic swimming.
Fish have no external ears, so there is no ear infection to catch. The real early-detection target is a skin parasite outbreak. This guide shows how to tell ich from velvet, what rubbing means before spots appear, and why treatment must run its full course.
Pale pits on the face and a pale eroded line down the flank are head and lateral line erosion, called hole-in-the-head in cichlids. The lesions trace the sensory canal system, and the causes are multiple: nitrate accumulation, an incomplete diet, chronic stress and, in cichlids, intestinal flagellates. Covers the look-
Fish do not learn names as obedience, but they do learn to associate a cue with food and can be taught to follow a target or come to a feeding station. How to train honestly and without overfeeding.
Fish have no tear ducts and no eyelids, so there is nothing to stain and nothing to wipe. A bulging or cloudy eye is a signal from the water or from inside the fish, and this guide explains how to tell those apart and what to do first.
A fish has no eyelids and no tear film, so eye injuries and eye problems are treated through the water, never on the eye. How to recognise trauma, protect the eye while it heals, and the things that make it worse.
Most fish that look to be dying are suffering from reversible water problems, so test the water first and rule out treatable disease. When a fish is truly suffering with no way back, the humane method is a clove oil overdose. Never flush a live fish or freeze it slowly.
Fish hide illness by instinct, so the early signs are quiet: clamped fins, reduced appetite, colour change, hiding, and altered position. How to read them against a fish's own normal and act before it becomes obvious.
Mains electricity, standing water and a hand that goes in weekly make an aquarium a special electrical case. How to protect the circuit, why the heater fails first, what stray voltage really means, and what to do the moment you feel a tingle from the water.
Fancy goldfish, show bettas and long-finned varieties are not sick, but their bred-for shape compresses organs, obstructs vision and makes swimming expensive. This guide covers what each trait costs the fish, how to tell a normal wen or bubble eye from disease, the low-flow smooth-decor tank these fish need, why sinkin
Most bubbles in an aquarium are harmless and one kind kills a whole tank in hours. Gas bubble disease happens when water holds more dissolved gas than it can keep, usually after a large refill straight from a cold pressurised tap or through an air leak on a filter intake, and the excess comes out of solution inside the
Fish are never bathed on a schedule. What people call a fish bath is a therapeutic immersion, usually in salt, and it is a treatment with a diagnosis behind it. This guide explains the osmotic mechanism, separates aquarium salt from Epsom salt and marine mix, names the scaleless and soft-water species that salt harms,
A pH crash is a buffer failure, not a pH problem. Carbonate hardness is consumed daily by biological filtration and decomposition, and when it runs out the pH slides, the filter stalls and ammonia accumulates as ammonium. This explains how to read the warning in your KH trend, how to tell a crash from a CO2 swing or an
Dry indoor air cannot dry out a fish, but a cold season does two real things to a tank: it pulls heat out faster than the heater replaces it, and it evaporates water quickly, concentrating everything left behind. This covers heater sizing, tank position, lids and insulation, and why topping up evaporation is not a wate
Zoning for fish happens inside a single tank, where every occupant shares the same water and territory. This guide covers compatibility by temperament, adult size and water needs, breaking sight lines, shoal sizes, and spotting chronic harassment before it kills.
Fish escape upward, not outward. Covering the whole water surface including equipment cut-outs prevents most deaths, while repeat jumping points to a water quality or oxygen problem.
A fish that was peaceful for months and now chases or bites its tankmates has a trigger you can identify: maturity, spawning, a change in the group, or a tank that has become too small and too bare. Here is how to separate them safely and fix the cause.
A formulated staple is the base of almost every aquarium diet, and fresh food belongs on top of it rather than instead of it. This guide covers choosing a food by mouth position and gut type, reading an aquarium label, why food degrades in the tub, and the specific failures of fresh diets including thiaminase in raw fi
Fish have no diaphragm and cannot truly vomit. Food spat back out is usually a pellet-size or water-quality issue, but repeated refusal with weight loss needs veterinary input.
Fish do not shed a coat, but they renew a living mucus layer that is their main barrier against infection. This guide explains what the slime coat does, why excess slime signals a chemical or parasite problem, how handling damages it, and the routine that keeps it intact.
Fish have no socialisation window. Their social needs are set by species. Learn which fish need a group, why aggression usually appears at maturity, and how to quarantine and introduce new tankmates without importing disease.
Fish do not vocalise for company, but keeping a shoaling species alone or in too small a group causes visible chronic stress. This guide explains why shoaling is a survival mechanism, what a settled group looks like, how group size distributes aggression, and which species must be kept alone instead.
A fish out of water is suffocating because its gill filaments collapse in air, and losing the slime coat wherever it touches a dry surface. This guide covers the wet-handed rescue, why the water it goes back into must be its own and never fresh tap water, the direction water must travel over the gills, the species that
Nitrate is the end of the nitrogen cycle and the filter does not remove it, so it accumulates until you export it. Worse, nitrification consumes carbonate hardness, and when the buffer runs out the pH falls sharply and the filter bacteria slow, producing ammonia in a tank that has been stable for years. This guide cove
Fish cannot run a fever, because their temperature is the water temperature. Low energy is still a real and useful sign. This guide explains what lethargy means in juvenile, adult and older fish, and which combinations need action today.
Fish cannot lick or groom. Repeated scraping against surfaces is flashing, a sign of skin or gill irritation from water chemistry or external parasites. Learn to tell it from normal algae grazing, what to test first, and when it is urgent.
A leaking or cracked aquarium is an electrical hazard and a life support failure at the same time. The order that works: power off, never move a tank with water in it, lower the level into clean buckets and keep that water, move the fish, and save the filter media wet. Also how to tell a real tank leak from the far mor
Fish that hide in a corner and look washed out usually have nowhere to disappear to. Adding cover makes fish more visible, not less. Covers why refuge changes behaviour, how breaking sightlines resolves territorial aggression, matching layout to surface, midwater and bottom species, flow gradients, the substrate barbel
A filter is not a strainer; it is the home of the bacteria that keep ammonia out of the water. This guide compares filter types and their failure modes, explains how to match flow and surface agitation to the species you keep, and covers the servicing errors that crash a mature tank, including tap-water rinsing, cartri
Adopting somebody else's fish means inheriting an animal of unknown age, a bacterial filter you cannot see, and water chemistry the fish has spent years adapting to. Most losses happen in the first week and almost all come from kindness: a deep clean, new media and a big water change. This guide covers the reality chec
Fish do not feel jealousy, but they do react to a new fish in their water. Adding a fish is the most common way disease enters a healthy tank. This guide covers quarantine, acclimatisation, evening introductions and resetting territories.
Fish are not introduced to a baby; the real task is protecting the tank from nursery aerosols and diffusers, which poison fish through the gills, and from lapsed maintenance during sleepless weeks. How to prepare and keep the tank stable.
Mycobacteriosis produces fish that waste away over months while still eating, in tanks whose water tests fine, and there is no reliable cure. This guide explains why a slow-growing organism produces slow disease, separates it from parasites and husbandry causes, sets out the biosecurity that actually reduces losses, an
Understimulation, stress, poor water quality, and early illness all look similar from outside the tank. Learn the order to sort them in, what settled behaviour looks like, and which signs mean act the same day.
Fish have no ears to clean. The checks that matter are gill colour and rate, and the mouth. This guide shows what healthy looks like, which changes mean act today, and why you must never wipe or brush a fish.
Fish do not choke the way mammals do. A fish gasping at the surface is running out of oxygen or being poisoned by its own water, and the response is aeration and a water change, not first aid on the animal. This guide gives the emergency sequence and covers genuinely lodged objects.
Fish are never groomed, brushed, or handled for cleaning. The equivalent routine is a partial water change and substrate clean, done on a schedule that protects the biological filter and keeps the fish in the tank throughout.
Fish do not greet, they have learned that a shape at the glass predicts food. This explains the conditioning behind the rush, the differentials that look identical to it including gasping and flaring at reflections, and the three things visitors reliably do to an aquarium: overfeed it, tap it and unplug it.
Tetras are peaceful, colourful schooling fish that shine in planted community tanks , but only when kept in real groups and given soft, stable water. This hub covers schooling numbers, water needs, the best and worst tank mates, feeding and the signs of a healthy shoal.
Snails in your tank can be tidy little clean-up helpers or an exploding nuisance, and telling them apart matters. This guide compares the useful species with the ones that overrun a tank, explains why populations boom, and shows humane ways to control them.
Almost any fish will eat baby shrimp, and many will hunt adults too. If you want a shrimp colony to thrive alongside fish, the choice of tank mates is everything. This comparison covers the safest species, the ones to avoid, and how heavy planting changes the odds.
Molting is how shrimp grow, and a discarded shell in your tank is usually good news. But failed molts can be fatal, and they almost always trace back to water parameters. This article shows you what a healthy molt looks like, the warning signs of trouble, and how to keep your minerals stable.
New to freshwater shrimp? This hub explains the two main groups, Neocaridina and Caridina, the water they each need, and how to keep a colony thriving from a fresh setup through a mature, breeding tank. Learn the numbers that matter and the signs of a happy shrimp.
"Pleco" covers many species , some stay small, but the common pleco reaches 30–45 cm and outgrows most home tanks. This hub explains adult size by species, why they are not just algae cleaners, their real diet, tank and water needs, and the health checks that keep them thriving.
A mature aquarium is stable and resilient , but stability is something you maintain, not something you win once. This guide covers the long-term routine, water-quality habits and seasonal adjustments that keep an established fish or shrimp tank healthy for years, without over-tinkering.
Guppies are hardy, colourful livebearers that make a great first fish, but they still need cycled water, a heater and steady parameters. This hub walks you through tank size, water quality, feeding, breeding surprises and the everyday signs that tell you a guppy is thriving.
Goldfish are biologically capable of living 15 to 20 years, yet many die within months. Discover the environmental realities of tank size, filtration, and the nitrogen cycle needed to help your fish thrive.
Goldfish are coldwater fish that grow large, live for years, and produce a lot of waste , the opposite of the tiny-bowl myth. This hub covers the space, strong filtration, cool stable water, and correct diet a goldfish really needs to stay healthy and avoid swim-bladder problems.
Velvet is a fast-moving parasite that coats a fish in a fine gold or rust-coloured dust and attacks the gills. It kills quickly and needs urgent action. This guide shows how to spot it with a torch, treat it correctly, and why speed matters so much.
If your fish floats, sinks, or swims upside down, its swim bladder, the organ that controls buoyancy, is likely involved. Many cases are diet-related and manageable at home. This guide explains the causes, the fasting-and-pea approach, and when it signals something more serious.
Ich, or white spot disease, is the most common fish parasite and looks like grains of salt scattered on the body and fins. Caught early it is very treatable. This guide covers how to recognise it, treat the whole tank correctly, and stop it coming back.
White fuzzy patches on a fish usually signal true fungus taking hold on damaged skin, or a bacterial look-alike. This guide helps you tell them apart, correct the water problem behind it, treat safely in a hospital tank, and know when the case needs a vet.
Fin rot makes a fish's fins look ragged, frayed, and shrinking, and it almost always starts with poor water quality. Caught early it is very reversible. This guide explains the stages, the water-first fix, when medication is needed, and how to prevent it returning.
A peaceful community tank is not luck , it is planning. This guide explains how to match temperament, size, water needs and swimming level, why schooling fish must be kept in groups, and the classic pairings that cause fin-nipping, bullying and stress so you can avoid them.
Breeding aquarium fish starts long before spawning: healthy conditioned adults, the right triggers, and a plan to protect eggs and feed fry. This guide walks you through choosing a species, conditioning your fish, encouraging a spawn, and raising fry through their fragile first few weeks.
Discus are stunning but demanding cichlids that need very warm, pristine water, a real group and a big commitment. This advanced hub covers temperature, water quality, group size, feeding and the health warning signs , plus honest advice on when discus are the wrong fish for you.
Corydoras are peaceful, social bottom-dwellers that need soft sand, a real group of their own kind and food that actually reaches the floor. This hub covers substrate, group size, feeding, water and the barbel and behaviour checks that tell you your cories are thriving.
CO2 is the biggest lever for lush plant growth, but it is not mandatory and it carries real risks to fish and shrimp. This guide compares pressurized systems, DIY yeast setups and liquid carbon so you can decide what your tank actually needs and dose it safely.
Breeding aquarium fish is a rewarding journey that requires careful planning, pristine water quality, and specific environmental triggers. Learn how to prepare your breeding pairs, prevent life-threatening conditions like egg-binding, and raise healthy fry from hatching to maturity.
Bettas are hardy and beautiful but widely mis-kept in tiny unheated bowls. This hub covers the real essentials , a heated filtered tank of adequate size, stable warm water, a correct meaty diet, and understanding their territorial temperament , so your betta lives a full, active, colourful life.
Regular water changes keep your aquarium safe, but done carelessly they shock fish with sudden temperature and chemistry swings. This step-by-step guide shows how much water to swap, how often, and how to treat and temperature-match replacement water so your fish barely notice the change.
Healthy adult fish cope with a short holiday far better than owners fear , and the biggest risk is overfeeding, not starvation. This guide covers how long fish can safely go without feeding, automatic feeders, pre-portioning for a sitter, and the water-quality checks that matter most before you leave.
Your test kit is the only way to see the invisible chemistry that keeps fish alive. This guide explains what ammonia, nitrite, and nitrate each mean, the target numbers to aim for, how to read the colours accurately, and exactly what to do when a reading comes back wrong.
When the power fails, your aquarium loses oxygen circulation, heating and filtration all at once. The two real threats are oxygen and temperature. This guide gives you a calm, prioritised plan and the cheap kit to prepare now, so a typhoon or blackout never becomes a tank wipe-out.
Nitrate is the end product of your tank's nitrogen cycle, and it slowly climbs between water changes. This guide explains safe target levels for fish and shrimp, the everyday causes of a slow rise, and a calm, step-by-step routine to lower nitrate without shocking your livestock.
A stable aquarium comes from small, regular tasks rather than occasional big clean-ups. This checklist breaks maintenance into simple daily, weekly and monthly routines for fish and shrimp tanks, so water stays healthy, problems get caught early, and your tank stays a pleasure to keep.
Aquarium lights are for your plants and your viewing pleasure, not for the fish, which do not need them. This FAQ covers how many hours to run your lights, why a timer matters, and how the right photoperiod keeps algae down while keeping plants and fish healthy.
Flakes, pellets, frozen and live foods each have strengths and drawbacks. This comparison explains what each type is best for, which fish and feeding zones they suit, and how to combine them into a varied, balanced diet that keeps your fish healthy and coloured up.
Overfeeding is the most common mistake in the hobby and a leading cause of dirty water and sick fish. This guide gives you simple rules for portion size and feeding frequency, how to read your fish and species differences, and how to adjust for fry, planted tanks and holidays.
Algae is the number one frustration for aquarium keepers, but each type tells you something different about your tank. This guide helps you identify green, brown, hair and black beard algae, understand what each one is caused by, and choose the right fix instead of guessing.
Algae is normal in every aquarium, but blooms mean something is out of balance. This guide shows how to control it by tuning light duration, cutting excess nutrients, and adding the right cleanup crew, plus how to tell which type of algae you actually have.
Angelfish are graceful cichlids that need a tall tank, warm stable water and carefully chosen tank mates , they will eat small fish and can turn territorial when paired. This hub covers tank shape, water, pairing behaviour, the tank mate traps to avoid and everyday health checks.
New fish arrive stressed and in water that may differ sharply from your tank. Acclimating them slowly prevents shock and saves lives. This guide explains the float and drip methods step by step, why not to pour in bag water, and the quarantine habit that protects your whole tank.
A tetra at the surface is an emergency and a betta at the surface may be perfectly healthy, because some fish carry a second breathing system. This guide covers the labyrinth organ and the gut breathers, what normal surfacing looks like in each, why the change in pattern rather than the act is the warning, the tank set
White fuzz on a fish is at least three different diseases with three different treatments. Columnaris is a bacterium that spreads faster in warm water and can kill in a day; true fungus only grows on tissue that was already damaged; whitespot is a parasite whose treatment involves the heat that makes columnaris worse.
Fish do not get travel sickness. What harms a transported fish is oxygen running out, ammonia turning toxic the moment the bag is opened, temperature swinging in a small volume, thrashing injuries, and a stress response that surfaces as disease days later. This covers fasting beforehand, the water-to-air ratio, why a s
Shrimp are arthropods and snails are molluscs, and both are killed by substances fish tolerate easily. Copper is the classic case: it disrupts invertebrate gill ion regulation, and it binds to substrate and silicone and leaches back for months, so a treated tank may never be safe again. This covers the products that ca
Food left in a tank overnight decays at the hour when dissolved oxygen is lowest, but the opposite mistake kills more fish: bottom-dwellers and night-active species are outcompeted by faster day feeders and their owners conclude they are not hungry. This covers the timed after-dark feed, matching food to species, why a
Fish food is built on marine oils, which are the fastest-oxidising fats there are, and on vitamins that degrade in air, heat and damp. A large tub bought to save money spends most of its life feeding degraded food, and the effects show up as slow growth, faded colour, poor healing and infections rather than as anything
