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 5 of 12
A healthy serpae tetra is a compact, deep-bodied fish in rich red, with a dark mark behind the gill, clean fins edged paler, and an alert, busy manner inside its school. Males tend to look more intensely red, while females are a little rounder and paler, which is normal variation; a serpae that has dulled, clamped its…
A healthy scissortail rasbora is a sleek silver fish whose large tail keeps opening and closing in the scissoring flick that gives the species its name, with bold black-and-white markings on the tail lobes; it schools calmly in the upper and middle water, feeds promptly and holds clear eyes and smooth scales. A…
A healthy peppered corydoras is busy at the bottom, pushing its snout into soft substrate, flicking its tail, and blinking as it works alongside its group; its mottled peppery patches sit on a clean, even body, its whisker-like barbels are full length rather than worn down, and its belly looks gently rounded when it…
A healthy peacock cichlid looks confident in its rockwork, with clear eyes, fins held open rather than clamped, and, in a mature male, strong blue, yellow or red colour rather than washed-out bars; it cruises, hovers and feeds eagerly instead of hanging listlessly at the surface or hiding all day. Judge females and…
A healthy panda corydoras wears its pattern crisply: a creamy-pink body with three clean black patches over the eye, under the dorsal fin, and at the tail base. Its six barbels should be full length as it sifts sand with its shoal, and it should breathe calmly, with only occasional quick dashes to the surface. A panda…
A healthy oscar is alert, interactive, and unmistakably hungry: it swims to the glass to greet you, tracks movement in the room with bright, clear eyes, and holds its large body level and powerful in the water. Its flanks should be clean and evenly coloured, fins complete, and the false eyespot near the tail clearly…
A healthy odessa barb is lively and cleanly marked, and a settled male shows the species' prize feature: a broad, fiery red band running along his silvery flank. Females stay paler with the same dark shoulder and fin markings, and both sexes should school actively, feed boldly, and carry complete, untattered fins. A…
A healthy nerite snail has a smooth, intact shell with clear stripes or patterns, no cracks or deep pitting, and a strong muscular foot that grips glass and rock firmly as it glides. It grazes steadily, extends two slender antennae, and withdraws quickly when touched, sealing itself with its hard trapdoor. A snail…
A healthy lemon tetra shows a soft lemon-yellow tint over a translucent body, a vivid red upper eye, and crisp black-and-yellow markings on the anal and dorsal fins. It schools actively in the middle of the tank, feeds with quick upward darts, and keeps its fins spread rather than clamped. Colour in this species…
A healthy kribensis is a colourful, confident bottom-dweller: look for a clear horizontal stripe, bright fins with clean edges, and, in females, a deep cherry-red belly when settled. It digs around its cave, swims with a smooth rocking motion, and eats eagerly without bloating. A krib that loses its colour, hovers…
A healthy honey gourami glows a warm, even gold, swims calmly through the middle and upper layers, and explores constantly with its two long, thread-like feelers. It should rise to the surface in a relaxed way, eat small foods readily, and hold its fins open with clean, unbroken edges. A gourami that turns dull or…
A healthy hillstream loach grips rock and glass with real strength, its flattened body sealed down by its broad fins as it shuffles forward rasping at algae. Its mottled pattern looks crisp, the belly underneath is pale and full rather than sunken, and it relocates confidently around the tank's flow. A loach that…
A healthy gold barb is richly golden-yellow with crisp dark blotches, clear eyes, and an alert, forward-leaning energy as it cruises with its companions. It should feed boldly, hold its fins open, and show a smooth body with no fading, fuzz, or white spots. Barb behaviour is busy by nature, so a gold barb that turns…
A healthy glowlight tetra carries a bright copper-orange stripe that catches the light along its translucent body, holds its fins open, and stays with the shoal in the middle layers of the tank. It feeds eagerly, darts smoothly without wobbling, and its colour stays strong rather than washing out. A tetra whose stripe…
A healthy ghost shrimp looks almost glass-clear, moves steadily on walking legs, and spends much of its time picking at surfaces for food. Its antennae sweep and flick, its swimmerets beat gently, and you may see a dark line of food moving through the gut inside the transparent body. A shrimp turning opaque or milky,…
A healthy firemouth cichlid carries the fire it is named for: a blue-grey body with dark vertical barring and a vivid red-orange throat and belly that intensifies when the fish flares its gill covers to show the dark throat spot. It patrols the lower and middle water confidently, sifts mouthfuls of substrate, and…
A healthy espei rasbora glows copper-orange along the back and flanks, marked by the species' signature black wedge — slimmer and more angled than a harlequin's — that runs from mid-body into the tail base. The school stays tight and active in mid-water, fins clear with warm orange tones, feeding eagerly at the…
A healthy Endler's livebearer male is a jewel box — splashes of orange, black, green and sometimes peacock-blue patterning over a small, active body — while females are larger, plain silver-olive and, in a mixed group, frequently rounded with developing young. Both sexes stay busy in the upper water, grazing algae…
A healthy ember tetra is a tiny ember indeed — a translucent amber-orange body that glows deepest in males and in fish kept in soft water over dark substrate, with a dark spot at the tail base and clear, complete fins. The school hovers and darts together in mid-water, feeding with quick snaps at fine foods. Embers…
A healthy dwarf rainbowfish — the praecox rainbow — flashes a silvery neon-blue body with fins edged in red on males and yellow-orange on females, and the colour visibly intensifies when males display in the morning light. The school stays active in the upper and middle water, feeding eagerly and sparring briefly…
A healthy discus is round, upright and interested: a tall, disc-shaped body held vertically in the water, bright clear eyes, even colour or patterning, and a thick forehead profile with no pinched look between the eyes. It cruises slowly with its group, comes forward at feeding and eats with real commitment rather…
A healthy convict cichlid is bold and busy: crisp black bars on a grey-blue body, fins erect, and a female showing her orange-gold belly patch as she digs, rearranges gravel and patrols her chosen corner. This species should look almost too confident — investigating the glass, claiming a cave and eating aggressively.…
A healthy Congo tetra shimmers — a silvery-blue body washed with gold and violet as it turns in the light, and in males long, flowing extensions on the dorsal and tail fins that stay whole and untattered. The school cruises the middle of the tank with confidence, feeding boldly at the surface without startling into…
A healthy clown pleco shows crisp orange-brown and dark banding, a sucker mouth that grips firmly, and a belly that looks gently rounded when it clings to the glass — never sunken or hollow-eyed. Because it is nocturnal and shy, health is best judged at dusk or after lights-out, when a well fish emerges to rasp on…
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