3,895 answers about fish & aquatics
A healthy aquarium is a balanced one — water chemistry, filtration, stocking and feeding all work together, and most fish problems start with the water. This page gathers the fish and aquatics library of KinsLe Answers in one place, organized by topic for freshwater and saltwater keepers alike. Every answer is original, written by KinsLe, and tied to a real KinsLe feature.
273 answers in Health & Vet Care — page 4 of 12
A healthy discus does not need regular trips to a clinic the way a dog does, because netting, bagging, and a temperature swing on the journey can stress this sensitive fish more than a routine visit helps. Instead, build routine care around frequent water testing, watching appetite and body shape at feeding, and…
A healthy boesemani rainbowfish does not need routine trips to a vet the way a dog does, because capture and transport are stressful and risky for a schooling fish. Instead, plan on a structured health review at home every few months, watching the whole school's colour, appetite, and swimming, and involve an aquatic…
For guppies, test ammonia, nitrite, nitrate, pH, and temperature with a liquid kit, and add hardness, since guppies do better in moderately hard water than in very soft water. Ammonia and nitrite should be zero, nitrate low, and the temperature warm and steady, because a small, busy guppy tank swings quickly and fry…
Test goldfish water with a liquid kit for ammonia, nitrite, nitrate, pH, and temperature, and expect the waste readings to be the battle, because goldfish produce far more waste than most aquarium fish. Ammonia and nitrite must read zero and nitrate needs regular, generous partial changes to stay down. Test just…
Test a corydoras tank with a liquid kit for ammonia, nitrite, nitrate, pH, and temperature, drawing the sample low in the water column near the substrate where these fish live. Ammonia and nitrite should be zero and nitrate low, because waste settles into the bottom layer corys feed and breathe in. Vacuum a small…
For cherry shrimp, test ammonia, nitrite, nitrate, pH, and temperature with a liquid kit, and add general and carbonate hardness, because shrimp need enough minerals in the water to moult properly. Ammonia and nitrite must be zero, nitrate kept low, and every value stable, since shrimp react badly to sudden change…
Test a betta tank with a liquid kit for ammonia, nitrite, nitrate, and pH, and verify the temperature with a thermometer rather than the heater dial. Small betta tanks foul quickly, so ammonia and nitrite must stay at zero, nitrate low, and the water warm and steady; also check that the filter flow is gentle enough…
Use a liquid test kit rather than strips for an angelfish tank, and check ammonia, nitrite, nitrate, pH, and temperature, plus hardness if you adjust your water. Ammonia and nitrite should read zero, nitrate should stay low through regular partial changes, and angelfish do best in warm, stable, slightly acidic to…
A guppy in discomfort loses its constant motion: it hangs at the surface or hides low in the plants, clamps its colourful fins, shimmies in place, or stops joining the group at feeding. A drooping tail, rapid gill movement, rubbing on leaves, white spots, or a female that retreats and refuses food all sharpen the…
A goldfish in pain or discomfort usually loses its usual boldness at feeding time: it stops rushing up for food, sits on the bottom or hangs listlessly at the surface, clamps its fins, or swims with an odd tilt or effort. Gasping, rubbing against ornaments, stringy pale waste, and a body that looks swollen or scales…
A corydoras in discomfort breaks from its group and its habits: it stops snuffling through the sand with its tankmates, sits alone and still for long periods, refuses food, or darts frantically and gulps at the surface far more often than its usual quick trips for air. Worn or missing barbels, clamped fins, flashing…
A bristlenose pleco in discomfort usually stops doing what it normally does after lights-out: it quits rasping on wood and glass, refuses algae wafers or vegetables it usually takes, hides through its active hours, or sits exposed in the open with its fins held tight. Flashing against driftwood, rapid gill movement, a…
You can tell a betta may be in pain or discomfort by watching for a clear change from its normal self: clamped fins, hiding or lying on the bottom, refusing food it usually takes, faded colour, rapid or laboured breathing, rubbing against decor, or struggling to swim and stay upright. Test the water first, since poor…
A zebra danio refusing food is unusual enough to take seriously, because danios are famously bold, greedy surface feeders that are normally first to every meal. One danio hanging back while the group feeds may be bullied, injured, or unwell, while a whole quiet group points to water or temperature trouble. Watch for a…
A pearl gourami that skips food is often feeling crowded, rushed, or exposed, because this is a slow, deliberate surface feeder that will not compete with boisterous tank mates. Watch whether it hangs back in cover while others feed, whether its long feelers are exploring normally, and whether a male tank mate is…
A neon tetra missing a meal is most often reacting to water that has drifted or to feeling exposed, because this tiny schooling fish is sensitive to unstable conditions and eats boldly only inside its group. Look for faded colour in the red stripe, fish scattering instead of schooling, and whether the whole group…
You may not have a problem at all: kuhli loaches are shy, eel-like night feeders that spend daylight hours hidden under decor and mostly eat after dark, so a daytime no-show is normal for this species. The real questions are whether the loach appears plump and active at night, and whether food is reaching the floor in…
A guppy off its food for a day is commonly stressed, harassed, or — in a female with a dark spot near her tail — close to giving birth. Watch whether she is hiding from persistent males, whether fins are clamped, and whether the fish is gasping at the surface or shimmying in place. Guppies are small and feel poor…
A goldfish skipping food for a day most often points back to its water or its last few meals, because this species produces heavy waste and feels dirty water quickly. Look for gulping at the surface, clamped fins, or a fish floating oddly or sitting on the bottom, which tell you more than the missed meal does. Test…
A single missed meal in a cherry barb is often about nerves rather than illness, because this is a shy, schooling fish that eats confidently only when it feels hidden and unhurried. Check whether tank mates reached the food first, whether the barb's colour has faded, and whether it is hovering alone instead of moving…
Your bristlenose pleco may have eaten perfectly well — just not while you were watching, because this is a largely nocturnal fish that hides by day and grazes algae, wood and sinking food overnight. Before concluding it is not eating, check the evidence after dark: a wafer softened or gone by morning, fresh rasp marks…
A betta that refuses food today is commonly reacting to cool water, an unfamiliar pellet, a recent tank change or simple fussiness, and one missed day in an otherwise bright, active fish is usually a cue to check conditions rather than panic. Bettas are surface feeders with small stomachs, so confirm the food is the…
An angelfish that skips food for one day is often reacting to something immediate — a water change, a shift in tank hierarchy, a new food it does not recognise, or water that has drifted — rather than announcing a serious illness on its own. Watch how it holds itself while you decide: a fish still cruising upright,…
A healthy white cloud mountain minnow is small but vivid, with a shining stripe along its flank, red touches on the tail and dorsal fin, clear eyes and constant, easy schooling movement. Males are slimmer and more brightly coloured, females rounder and a little paler, and both are normal. Because this is a cool-water…
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