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.
337 answers in Grooming & Daily Care — page 8 of 15
Discus need more frequent partial water changes than most community fish — plan on about 30 to 50 percent two or three times a week for adults in a well-stocked tank, with smaller daily changes helping fast-growing juveniles stay ahead of waste. Discus eat rich foods, live in unusually warm water, and react badly to…
Convict cichlids need a partial change of about a third of the tank once a week as a minimum, and a breeding pair with fry often needs a second change in the same week. Convicts are famously hardy, but they are also big eaters, enthusiastic diggers, and relentless parents whose tanks accumulate waste fast. Siphon the…
Congo tetras need a partial change of about a third of the tank once a week to protect what makes them special: the iridescent blue-green sheen and long, flowing finnage of the males. These are larger, boisterous tetras from the Congo River, and a full school eats and excretes like the mid-sized fish they are. Stale…
Clown plecos need a solid partial change of about a third of the tank once a week — more than their small size suggests — because this catfish eats driftwood and produces a constant stream of woody waste. The sawdust-like debris piles up around its wood and cave, and the filter loads quickly even in a lightly stocked…
Chili rasboras do best with very small partial changes — about a tenth to a fifth of the tank once a week, or even smaller swaps twice a week. These ember-red rasboras are among the smallest aquarium fish and come from peat-stained blackwater, so stability matters more to them than sheer freshness. Condition every…
Celestial pearl danios need a partial change of about a quarter of the tank once a week, done carefully because these thumbnail-sized fish usually live in small aquariums where every bucket is a big event. A nano tank's water can drift quickly, yet a huge change can swing it just as fast, so steady quarter changes…
Cardinal tetras do best with a modest partial change of about a fifth to a quarter of the tank once a week, kept small and steady rather than large and rare. These little blackwater fish carry a full-length red stripe that greys when water slips, and they are far more sensitive to sudden shifts than their neon tetra…
Bronze corydoras need a partial change of about a quarter of the tank once a week, with the siphon time spent where they live: on the bottom. Corydoras root through the substrate with delicate barbels, and waste trapped down there erodes those barbels and dulls the fish's bronze-green sheen. Vacuum the open floor…
Boeseman's rainbowfish need a generous partial change of about a third of the tank once a week, and many keepers do slightly more for a full school. These active Australian rainbowfish were built for clean, flowing, oxygen-rich water, and their famous half-blue, half-orange colour washes out quickly when nitrate…
Blue gouramis need a partial change of about a quarter to a third of the tank once a week, leaning larger than for small tetras because a fully grown gourami is a big fish producing big-fish waste. They breathe surface air through a labyrinth organ and are hardy, but their long, trailing pelvic fins fray quickly in…
Black skirt tetras are among the more forgiving schooling fish, and a partial change of about a quarter of the tank once a week keeps most groups in good shape. Their flowing black anal fins fade to grey when water quality slips, so treat colour as your early warning. Siphon the gravel where their food lands, match…
Bamboo shrimp usually need a small partial change of about a fifth of the tank once a week, kept deliberately modest. Unlike fish that graze or hunt, a bamboo shrimp fans microscopic food from the current, and it is far more unsettled by sudden shifts in temperature or chemistry than by slightly older water. Condition…
Most apistogrammas do best with a partial change of about a quarter of the tank once a week, and sensitive wild-caught pairs often prefer two smaller swaps instead of one big one. These dwarf cichlids come from soft, leaf-stained waters and react badly to sudden swings, so match the new water's temperature and…
Amano shrimp need partial water changes on a small, steady rhythm rather than occasional large ones: for most home aquariums that means modest partial changes at regular weekly intervals, sized so the water going in closely matches the tank in temperature and character. Shrimp feel sudden shifts far more than fish do,…
Because the media is not just a sieve — its surfaces hold most of the nitrifying bacteria that turn toxic ammonia into safer compounds, and replacing every sponge, pad and ring in one session throws that colony away with the rubbish. The tank then re-cycles with fish in it: ammonia climbs, nitrite follows, and an…
Two minutes buys you five glances: the thermometer, the fish themselves, the filter's flow, the waterline, and the cabinet floor. Read the temperature, then watch the fish for a slow count — everyone present, swimming normally, no one clamped or gasping at the surface — and confirm the filter outflow is rippling the…
Clean by part, not by the whole filter: the mechanical pads and floss that trap debris need rinsing or replacing most often — every few weeks, or whenever the outflow weakens — while sponges get a gentle squeeze in removed tank water about monthly. Biological media should barely be touched at all, just a swish if it…
Control the siphon, not the fish: pinch the hose to slow the flow whenever a shrimplet drifts near the vacuum bell, and hover the bell just above the gravel instead of burying it, lifting settled dirt while the current stays too weak to lift an animal. Work the open gravel in sections and leave planted corners and…
Top up little and often with dechlorinated water at roughly tank temperature, poured in slowly, and you will never shock anything. Only pure water evaporates; the minerals stay behind, so a big weekly pour of tap water both swings the temperature and slowly concentrates hardness, while small daily additions barely…
Rinse the media in a bucket of water you have just siphoned out of the tank — never under the tap, because the chlorine added to drinking water damages the nitrifying bacteria living on every sponge and ceramic ring. Lift the media out, swish and squeeze the sponges in that bucket until the water runs browner than the…
Act the same day: uneaten pellets start breaking down within hours, clouding the water and feeding the ammonia your filter then has to handle. Suck up leftovers with a dedicated turkey baster for small spills, or run the gravel siphon over the feeding area after a bigger overfeed, aiming at corners, plant bases and…
First work out which problem you have: hard-water marks are chalky white deposits sitting on the surface, while a true scratch is a groove you can feel with a fingernail. Mineral marks dissolve — press a cloth dampened with plain white vinegar against the crust, let it soften, then rub and rinse the area well before…
That brown, dusty film coating the glass and gravel is a diatom bloom, and in a new tank it is a normal stage rather than a failure — diatoms feed on silicates leaching from fresh substrate and new glass, and they fade as the tank matures and other algae and bacteria outcompete them. Wipe the glass, gently vacuum the…
Put the spray bottle away: a microfiber cloth lightly dampened with warm water polishes the outside pane clean, lifting fingerprints, dried drips and salt creep with no chemical anywhere near the water. Work in small circles, then buff with a second, dry cloth so the glass dries streak-free. Keep one cloth reserved…
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