Peqaboo series
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.
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.
Spotting white spots, frayed fins, or bloating in your aquarium? Learn how to visually diagnose and successfully treat the four most common fish diseases, Ich, Fin Rot, Velvet, and Dropsy, with our step-by-step quarantine and treatment guide.
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.
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.
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.
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.
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.
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.
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.
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.
A fish's body temperature is the water temperature, so a failed heater or a power cut is a real emergency. Learn how cold suppresses immunity, the safe order for rewarming, and why white spot and bacterial infections so often follow a chilling event.
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
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
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
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.
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.
Dropsy is not a disease. It is fluid building up inside a fish because the organs that should move that fluid have stopped working, and the scales stand out because the body wall is stretched from within. Here is what it tells you about the fish, how to separate it from the things that look like it, and an honest accou
Fish have no legs and cannot limp. The equivalent problem is a fish that has lost control of its position in the water. This guide separates feeding-related buoyancy changes from progressive internal disease and explains what is safe to do at home.
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 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 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.
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
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 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.
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 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 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,
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 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.
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.
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.
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.
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.
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.
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
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
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,
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,
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.
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
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
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.
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
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
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.
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
