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 2 of 12
A threadfin rainbowfish needs a vet when it stops fluttering up for food with the group, because males display and feed in the same energetic motion and a grounded fish stands out quickly. Refusal often starts with food size, since that tiny upturned mouth cannot manage standard flakes, but refusal of finely crushed…
A sparkling gourami needs a vet when it stops picking at the surface and plant edges for several days, because this tiny labyrinth fish feeds in small, frequent bouts that are easy to overlook. Refusal alongside faded sparkle, a tucked-away posture under leaves, or silence from a male that used to croak at rivals…
A scarlet badis needs a vet when it refuses even live or frozen micro foods it normally hunts, because this tiny predator is famously fussy and a total refusal is a step beyond pickiness. A male whose red bars have gone dull, a fish that no longer patrols its plant thicket, or a visibly hollow belly all mean the call…
A rummy-nose tetra needs a vet when it stops schooling up to food with the group, because this species feeds as a tight unit and a fish hanging back alone is already telling you something. A washed-out nose is the second clue, since a healthy rummy's red face pales under stress or illness. If several fish fade and…
A pearl gourami needs a vet when it stops rising to the surface for food across two or three days, because this calm labyrinth fish normally feeds at the top with quiet confidence. Refusal paired with hiding behind plants, faded pearl spotting, or a male losing his orange throat colour makes the call more urgent. Note…
A kuhli loach needs a vet when it stops emerging for food at night for several evenings in a row, because this shy bottom feeder can be missed easily during daytime checks. Coming out in daylight looking thin, refusing sinking food left right beside its hiding place, or showing a pinched belly behind the head all…
A hillstream loach needs attention when it stops grazing altogether, because a healthy one works over rocks and glass almost constantly rather than eating at set meals. Refusal paired with a thinning body behind the sucker mouth, sitting in still corners away from the flow, or pale colour means an aquatic vet should…
A harlequin rasbora that skips one feeding while the shoal eats is usually just outcompeted, but refusal across two days, spitting food out repeatedly, or eating eagerly one day and hiding the next deserves an aquatic vet call. Watch the copper wedge markings too, because faded colour alongside a shrinking belly…
A white cloud mountain minnow in discomfort stops flashing its fins with its schoolmates: it hangs back from the group, its gold stripe and red fin edges look dull, and it swims with a stiff, effortful beat instead of the usual light darting. Because this hardy fish tolerates a lot before showing anything, visible…
A scarlet badis in discomfort loses the very things that define it: the male's scarlet bands fade to dull brown, he abandons his small hunting territory near the bottom, and he stops stalking tiny live foods with his usual slow, deliberate aim. A badis that hides through feeding time or sits listless on a leaf while…
A rummy-nose tetra carries its warning on its face: when this schooling tetra is uncomfortable, the bright red nose fades to pale pink or white, the black-and-white tail markings blur, and the fish drops out of the school's tight formation to hover weakly at the back. A red nose on the whole school means settled fish,…
A pearl gourami in discomfort usually loses its sparkle and its curiosity: the pearly spotting dulls, the long feelers hang limp instead of reaching out to touch food and tankmates, and the fish parks itself in a quiet corner or makes repeated laboured trips to the surface. Refusing food it normally investigates…
A kuhli loach in discomfort is harder to read because it hides by day, so judge it at dusk: a struggling loach stays buried or wedged even during its usual active hours, refuses the sinking foods it normally snuffles up after lights-out, looks pale between its bands, or shows worn barbels from frantic digging.…
A harlequin rasbora in discomfort usually breaks from its school: it hovers alone at an angle, its copper colour and black wedge look washed out, and it stops keeping pace with the group's smooth circuits, lagging or drifting at the edges. Gasping near the surface, clamped fins, and ignoring the small foods the rest…
A clown killifish in discomfort leaves its favourite surface hangout, loses the crisp barring and blue sheen along its body, and stops picking at tiny foods near the top, instead drifting midwater with clamped fins or gasping just under the surface film. Because this little surface-dweller normally rests almost…
A celestial pearl danio that is hurting usually leaves the loose group, fades its pearl spotting, clamps its orange-red fins, and hovers low among the plants instead of making the short display darts males use to court and spar. Skipped feeds and a hunched, still posture behind leaves are stronger warnings than one…
A bumblebee goby in discomfort usually stops doing its normal perch-and-dart routine: it sits pressed flat on the substrate for long stretches, its yellow bands look dull or grey, it refuses the small meaty foods it normally snaps up, and it may rub against rockwork or gulp at one spot instead of hopping between…
Fish show discomfort through behaviour and body changes rather than sound, so read a boesemani rainbowfish against its normal vivid self. Warning signs include colour draining from the blue front half or orange rear, clamped fins, hiding or leaving the school, flashing against decor, rapid gill movement, loss of…
See a vet about a guppy that refuses food for more than two days, stops eating suddenly after feeding eagerly with its group, mouths food and spits it out every time, or eats but becomes progressively thinner with a hollow belly. In a group fish like a guppy, confirm first that it is not simply being outcompeted or…
A goldfish should see a vet if it refuses food completely for more than two to three days, suddenly stops eating after feeding greedily, takes food in and spits it out repeatedly, or keeps eating but loses body condition. Appetite loss with gasping, bottom-sitting, swelling, raised scales, or loss of balance needs…
Prompt a vet visit for a corydoras that stops finding and eating sinking food for several days, grows thinner while its group feeds normally, suddenly leaves food it previously ate eagerly, or shows worn barbels, redness, or rapid breathing alongside the appetite loss. Because corydoras feed at the bottom, first…
Book a vet visit for a betta that refuses all food for more than two to three days, suddenly stops eating after a period of eating greedily, spits out every food type, or eats normally but keeps losing weight and condition. Appetite loss paired with bloating, clamped fins, lethargy, raised scales, or laboured…
A goldfish stressed by a move may clamp its fins, sit on the bottom, gasp at the surface, lose its usual interest in food, develop stress-related colour dulling, or swim erratically and bump into decor. Because goldfish produce a lot of waste, worsening water in a new or undersized setup is a frequent hidden cause, so…
A stressed corydoras after a move often goes still on the substrate for long periods, stops its usual busy snuffling for food, loses colour, breathes fast, darts to the surface more often than usual, or hides alone away from its group. Watch its barbels too, because short, worn, or frayed whiskers and redness around…
Can't find your question? Ask it here. We answer reader questions in KinsLe Answers — and we'll email you when yours is published.
KinsLe is launching soon — and the waitlist hears the date first. Join for launch updates and first access when the app opens.
We email you about the launch. Unsubscribe anytime.