Life-stage guide
Water testing rhythm, feeding discipline and early disease signs.
A sponge filter is chosen for a shrimp tank because it has no impeller and grows biofilm shrimp can graze. The filter is the bacteria inside the foam, not the plastic: it has to be cycled before shrimp arrive, squeezed out in tank water rather than rinsed under the tap, and never replaced with a fresh sponge. Any other
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.
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
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
A small aquarium is the harder version of the hobby, not the easier one, because every input arrives at a higher concentration and the water tracks the room. This guide explains the dilution, thermal mass and buffering mechanisms behind nano tank failures, and gives the placement, stocking and weekly routine that compe
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
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 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
A dead fish is a load on a closed system as well as a loss: decomposition consumes oxygen and releases ammonia into the water the survivors are breathing. Learn the order of the first hour, which findings on the body are real and which happen to every fish after death, how the pattern of deaths separates an oxygen cras
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.
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.
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,
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
Pet fish are not vaccinated, so quarantine is the preventive milestone that replaces it. This guide covers how to set up a quarantine tank, what normal arrival stress looks like, what to watch for week by week, and why blanket medicating a healthy new fish is the wrong default.
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.
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.
Aquarium salt does three things: it protects against nitrite at the gill, it reduces the osmotic work a damaged fish does, and it kills the free-swimming stages of some external parasites. It does not treat internal infection, internal parasites, dropsy or buoyancy problems. Two facts decide whether it helps or harms:
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
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
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.
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
Most fish that die in the first month of a new aquarium are poisoned by their own waste. A new tank has none of the bacteria that convert ammonia to nitrite and nitrite to nitrate, so both build up to levels that burn gills and destroy the blood's ability to carry oxygen. Here is the mechanism, how to cycle a tank with
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 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 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
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.
A practical guide to cycling a new aquarium: the fishless method step by step, seeding the filter to speed it up, and why bottled instant-cycle products, a few hardy fish, or plants alone cannot replace a grown bacterial colony.
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 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.
Your tank is cycled and stocked , but it is not yet mature. The first two to three months are a settling-in phase full of small algae blooms, cloudy spells and shifting readings. This guide explains what is normal, what is not, and how to help your tank find its balance.
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.
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.
Getting salinity right is the foundation of every marine tank. This guide explains what salinity and specific gravity actually mean, why a refractometer beats a hydrometer, the target range for reef and fish-only tanks, and a clean step-by-step method for mixing consistent saltwater every time.
"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.
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 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.
Fish crowding the surface and gulping is a one-hour problem, not a tomorrow problem. This plan walks you through the immediate fixes , aeration, water change, testing , in the right order.
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.
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.
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.
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.
A quarantine tank is the single cheapest insurance against wiping out your whole aquarium. It isolates new fish so hidden diseases surface before they reach your main tank. Here is why it matters, exactly what you need, and how to run a proper four-week quarantine.
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.
pH, GH, and KH confuse many new aquarists, yet together they decide which fish will thrive and how stable your tank stays. This article explains each measure in plain language, how they interact, and why chasing a perfect pH number is usually the wrong goal.
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.
Stable water temperature keeps tropical fish healthy and disease-free. This guide covers how to size a heater to your tank, where to place it for even heat, the safe temperature ranges for common fish, and the warning signs of a heater that is failing or cooking your tank.
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.
The most important part of your filter is invisible: colonies of beneficial bacteria that convert toxic fish waste into safer compounds. Understanding this nitrogen cycle explains new-tank syndrome, why you cycle a tank before adding fish, and how to keep those bacteria alive and thriving.
Ammonia is highly toxic and can kill fish within hours. If your fish are gasping at the surface in a new or recently disturbed tank, you are likely facing a spike. This guide walks you through the immediate steps to protect your fish while the tank recovers, and when to call a vet.
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.
For a fish, the water is everything at once: its air, its home and its toilet. This guide explains the nitrogen cycle that makes an aquarium liveable, the parameters that matter, a reliable maintenance routine, and how to handle an ammonia emergency calmly.
A fish keeps its whole body wrapped in a living slime coat, its first defence against parasites and bacteria. This guide explains how that barrier works, how to read early warning signs, and the water-first routine that keeps skin and fins healthy.
How a fish swims is a live readout of its health. This guide shows you the anatomy behind movement, how to tell normal from abnormal, the conditions that change swimming, and a calm, methodical way to respond before a small wobble becomes an emergency.
Fish cannot warm or cool themselves, so their whole biology runs at whatever temperature you give them. This guide covers the right ranges, the gear that keeps them stable, safe water-change technique, and how to handle a heater failure without losing your fish.
A practical guide to fish gill health, explaining how gills breathe, balance salt, and excrete ammonia, why water quality drives almost all gill disease, how to read colour and breathing changes, and when gasping, brown gills, or rot mean it is time to call an aquatic vet.
A step-by-step guide to aquarium filter maintenance that keeps your nitrogen cycle intact: how mechanical, chemical, and biological filtration work, the two golden rules of cleaning, a full routine, pro media-basket tips, and troubleshooting for low flow, noise, and cloudy water.
A practical companion-care guide for aquarium fish that treats the tank as a living ecosystem: it shows how water chemistry, the nitrogen cycle, weekly maintenance, quarantine, and simple daily observation all work together to prevent disease and keep your fish thriving for years.
Underwater, every wound sits in a bath of pathogens, so water quality does most of the healing. Learn to read the slime coat, build a hospital-tank kit, match treatment to bacterial, fungal or parasitic causes, and know exactly when an aquatic vet is essential.
A fish will not be stung by an insect, but insecticide sprayed in the room reaches the tank through the air and is absorbed straight through the gills. This guide covers airborne exposure, species-linked sensitivity in scaleless fish and invertebrates, and what to do in the first hour.
Ammonia damages gills, and gills take weeks to heal. Understand why pH and temperature change how toxic the same reading is, follow the correct emergency order, and watch for the secondary infections that kill fish a fortnight after the water was fixed.
A whole tank irritated within hours of a water change is a water problem, not a parasite. This guide covers why chloramine does not gas off from a standing bucket, how copper from pipework kills invertebrates first, why softened and reverse osmosis water are unsuitable untreated, the specific ways conditioner dosing go
Rapid gill movement means one of three things: too little oxygen in the water, gills that cannot use it, or blood that cannot carry it. This guide explains how gill surface area is lost to flukes, bacterial disease and chemical damage, why nitrite suffocates a fish in fully oxygenated water, how to spot gas supersatura
Fish are silent, but aquarium equipment is not. Learn which part of the tank is making the noise, how to decouple vibration from furniture and floors, and why turning the filter off at night is never the answer.
Fish urine goes straight into the water and cannot be observed, but faeces can. White stringy droppings are shed intestinal mucus rather than food, and the meaning changes completely depending on whether the fish is still eating. This guide covers the differentials, the species that vary, and why testing water before m
Always condition new tap water before changes and top-ups. Chlorine and chloramine burn gills and can crash your biofilter.
