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 7 of 15
Change a betta's water by siphoning out a modest portion, vacuuming waste from the gravel as you go, and refilling with conditioned water matched carefully to the tank's temperature, poured in a slow trickle that never shoves a long-finned betta around its own home. Leave the fish in the tank throughout, keep enough…
For angelfish, prepare dechlorinated water matched closely to the tank's temperature, siphon out roughly a quarter of the water while vacuuming debris lightly, then refill slowly by pouring against the glass or over a saucer so the current never buffets these tall, easily spooked fish. Work quietly around a guarding…
Clean algae from a guppy tank's glass with a soft pad in gentle strokes, checking every corner and the waterline for tiny fry before you start, because newborn guppies shelter near surfaces and plants and are easily trapped or startled by cleaning tools. Favour a hand pad over a magnetic cleaner, whose snapping halves…
Scrub algae from a goldfish tank's glass with a sturdy aquarium pad, or a blade scraper on glass only, working before a water change because goldfish waste loads the water and loosened algae adds to it. Expect your goldfish to crowd the scraper hoping it stirs up food, work steadily around them, and tackle the crusty…
Wipe algae from a corydoras tank's glass with a plain aquarium pad in smooth downward strokes, cleaning before a water change so the film you loosen can be siphoned away rather than settling over the bottom where your corys feed. Work the lower panes carefully and rinse the pad often, because gritty debris dragged…
Use a soft algae pad on a betta tank's glass, moving in short, gentle strokes, and expect your betta to follow the pad and investigate it rather than hide. Keep strokes slow near the surface where a betta rests and breathes, never use a household sponge or any cleaner, and avoid snapping a magnetic cleaner together…
Clean algae from an angelfish tank's glass with a plain aquarium algae pad or scraper, working slowly from the top down in smooth strokes while the fish stay in the tank. Move gently and predictably, because tall, easily startled angelfish can bolt into decor if a hand lunges, and pause well away from any pair…
White cloud mountain minnows need a partial water change about once a week in most home aquariums, replacing roughly a quarter of the water with dechlorinated water that is not warmer than the tank. These cool-water fish are hardy, and a very lightly stocked, well-planted tank can stretch a little longer, but a weekly…
Tiger barbs need a partial water change once a week, replacing roughly a quarter of the water with dechlorinated water near the tank temperature. This is a high-energy school that eats greedily and produces waste at a pace to match, so crowded barb tanks may need a second smaller change in the same week rather than a…
Threadfin rainbowfish need a partial water change once a week, replacing about a fifth to a quarter of the water with dechlorinated water matched very closely in temperature. Their long, delicate fins and small throats belong to fish built for clean, calm water, so favour gentle weekly changes and pour the refill in…
Serpae tetras need a partial water change once a week, replacing roughly a quarter of the water with dechlorinated water close to the tank temperature. They are hardier than many tetras, but their bold, nippy behaviour gets worse in stale water, and uneaten food from their eager feeding raises the waste load quickly.…
Rummy nose tetras need a partial water change once a week, swapping roughly a quarter of the water for dechlorinated water at a closely matched temperature. This school is famously honest about water quality — the red on their noses fades when conditions slip — so favour small, steady weekly changes over occasional…
Most peppered corydoras do best with a partial water change once a week, replacing roughly a quarter of the tank water with dechlorinated water matched close to the tank temperature. Because these catfish live and feed right on the substrate, waste that settles into the gravel reaches them first, so vacuum the bottom…
Panda corydoras need a partial water change of about 20 to 25 percent once a week, siphoned gently over the sand rather than dug into it. These small, social bottom dwellers sift the substrate all day through delicate sensory barbels, so waste settling into the bed affects them first, yet rough vacuuming and sudden…
Oscars need very large water changes: about 30 to 50 percent once a week at minimum, and twice-weekly changes suit most adult oscars in typical home tanks far better. An oscar is a big, messy predator that eats heartily, digs in the gravel, and produces waste on a scale small community fish never approach, so nitrate…
Nerite snails need a partial water change of about 20 to 25 percent once a week, with the emphasis on steady mineral levels rather than on the snails' own waste. Nerites are tireless algae grazers and produce little mess, but they are sensitive to ammonia spikes and need consistently hard, mineral-rich water to…
Lemon tetras need a partial water change of about 25 percent once a week. Bigger and more active than the tiny ember or glowlight tetras, a proper lemon tetra school produces a moderate waste load, and the males' lemon-yellow fins and red eyes only show fully when the water stays fresh and slightly soft. Siphon the…
Kribensis need a partial water change of about 25 to 30 percent once a week, done carefully around their cave and any fry. This cave-spawning cichlid pair invests heavily in a chosen hiding place, and waste collecting near the cave floor undermines both the adults' health and the fry they shepherd out each day. Siphon…
Honey gouramis do best with a partial water change of about 20 to 25 percent once a week, carried out gently so the surface stays calm. A breeding male builds a fragile bubble nest among floating plants, and a careless refill can scatter it in seconds, while sudden temperature shifts stress this shy, slow-moving fish.…
Hillstream loaches need a generous partial change of about 30 to 40 percent once a week, and twice-weekly smaller changes suit heavily stocked river tanks even better. These loaches evolved in cool, fast, highly oxygenated streams, and they graze constantly on algae and biofilm, so waste and low oxygen trouble them…
Glowlight tetras thrive with a partial water change of about 20 to 25 percent once a week. This peaceful blackwater schooling fish colours up best in soft, slightly acidic, very stable water, so the goal of each change is gentle refreshment rather than a reset — matched temperature, treated water added back gradually,…
Ghost shrimp need small partial water changes of roughly 15 to 20 percent once a week, added back slowly rather than poured in. Shrimp are far more sensitive than fish to sudden shifts in temperature and water chemistry, and a big, fast change can trigger a failed moult or send several shrimp into distress at once.…
Endler's livebearers do well with a partial change of about 25 to 30 percent once a week, but a breeding colony often needs that change stepped up as fry grow and the population climbs. Endlers are hardy and active, yet they reproduce constantly, so a tank that was lightly stocked in spring can be heavily stocked by…
A school of ember tetras usually needs a modest partial water change of about 20 to 25 percent once a week. These are tiny fish with a very light waste load, especially in a planted nano tank, so huge or frequent changes do more harm than good by swinging temperature and chemistry for fish that prize stability. Siphon…
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