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.
351 answers in Feeding & Nutrition — page 11 of 15
A snail builds its shell from calcium it eats and calcium dissolved in the water, so feed both routes: blanched kale or collard greens, a piece of cuttlebone resting on the substrate, and mineral-rich snail food offered regularly. Soft, acidic water quietly works against you by eroding existing shell, so white pitting…
Pond goldfish are fed by the thermometer, not the clock: their metabolism slows as the water cools, so meals shrink through autumn, switch to an easily digested wheatgerm food in the cool weeks, and stop altogether once the water stays properly cold. In warm weather they get floating food, so you can watch them eat…
Feed a newly cycled tank as if the filter is still learning its job, because it is: offer one small meal a day, no more than the fish finish in a minute or two, and remove anything uneaten. The young bacterial colony is sized to a tiny waste load, and every extra pinch of food becomes ammonia faster than the colony…
Feed the tank in layers and in sequence: floating food first for the surface feeders, slow-sinking food next for the midwater school, and sinking wafers or pellets dropped in after lights-out for the bottom feeders. One mixed handful fails because top fish intercept everything and shy bottom fish get only scraps, so…
A betta's stomach is only about the size of its eye, so a small counted portion — a few quality pellets once or twice a day — is a full meal, and pre-soaking dry pellets for a few minutes stops them swelling inside the fish. Build in one fast day a week, and swap in frozen daphnia now and then, because that gentle…
Microworms culture in a lidded tub on cooked oatmeal paste, harvested by wiping the worms that climb the walls, while daphnia need a bucket or spare tank of aged, greenish water and gentle feeding to multiply. Run two of each culture side by side, because cultures crash without warning and a backup keeps fry fed while…
Blanching softens firm vegetables just enough for rasping mouths: simmer zucchini rounds, spinach or kale briefly until they bend and start to sink, cool them, then clip or weigh them down where your plecos, otos or snails graze. Softened tissue gives algae eaters the plant matter their digestion expects, in a form…
Adjust by appetite, not arithmetic: more fish does not mean proportionally more food, so keep offering what the whole group can finish in about two minutes and watch who actually eats. New arrivals often hang back while established fish charge the surface, so scatter food across a wider area, and drop sinking food…
Healthy adult leopard danios need feeding once or twice a day - no more than they can clear in about two minutes. They are fast, confident surface-and-midwater feeders, so scatter a small pinch of micro pellets or crushed flake widely enough that every fish gets a share before it sinks. A varied week, with frozen…
As pond water cools, feed less and change what you offer: pond fish digest slowly in cold water, so move to a wheatgerm-based food in autumn, feed only what they finish in a few minutes, and only on milder days when they are active at the surface. Stop feeding altogether once the water stays cold and the fish settle…
Sitters overfeed out of kindness and guesswork: fish beg convincingly at the glass, a pinch in an unfamiliar hand can be five times yours, and nobody wants a pet to go hungry on their watch. Prevent it by removing the judgement call — portion every day's food yourself into a labelled pill organiser or small pots…
Courgette is the pleco staple — a thick slice, lightly blanched or weighted raw, gets rasped for hours — with cucumber, blanched sweet potato and butternut squash, broccoli stems, shelled peas and blanched spinach or romaine all taken well by plecos and other herbivores. Serve vegetables in the evening, when plecos…
The treats goldfish do best on are shelled peas — blanch one, slip off the skin and squash the soft inside — along with daphnia, the occasional small serving of thawed bloodworm, chopped rinsed earthworm, and leafy greens clipped to the glass for grazing. The popular treats that cause problems are bread and human…
Newly settled juvenile angelfish grow best on small, protein-rich foods offered often: freshly hatched brine shrimp are the classic starter because the movement triggers strikes, backed up by microworms and finely crushed quality flake or micro-pellets. Feed three or four small meals a day, each eaten within a few…
Watch behaviour first: shrimp that once grazed casually now swarm any food in seconds and strip it bare, and shrimp working the filter sponge and the same few surfaces constantly are finding thin pickings. Breeding tells the same story — females carry eggs less often, and newborn shrimplets, which live entirely on…
Feed a recovering fish little and often: two or three tiny meals a day of soft, easily taken food — thawed frozen daphnia or brine shrimp, soaked softened pellet, or fine flake — placed close to where it rests, because a weak fish will not chase food or compete at the surface. Rich foods like bloodworm come back…
Start smaller than instinct says: for a school of a dozen small tetras, one two-finger pinch of fine crumbled flake or micro-granules — about the size of a pea — is a full meal. Sprinkle it crushed across the surface so the whole school eats at once, and time it: everything should disappear within about two minutes,…
Tropical fish take a wide range of live foods: daphnia and adult brine shrimp for most community fish, newly hatched brine shrimp and microworms for small mouths, mosquito larvae for surface feeders, and chopped earthworm for larger species. Frozen versions of the same foods — bloodworms thawed in tank water, frozen…
A weekly food-free day suits most healthy adult community fish: it lets their digestive tracts clear completely, reduces waste in the water, and helps prevent the bloat that greedy species like livebearers and goldfish are prone to. Fasting is not helpful for fry and juveniles, which need food for growth, for fish…
Algae alone rarely sustains an algae eater for long, because a healthy tank simply does not grow enough of the right kinds. Otocinclus, plecos, Siamese algae eaters and algae-eating shrimp need prepared foods too: algae wafers and sinking pellets for the grazers, blanched vegetables such as courgette and spinach, and…
The clearest signs show up in the water and on the glass rather than in the fish themselves: leftover flakes or pellets still drifting minutes after feeding, a cloudy or milky haze, green algae creeping across the glass, and a filter that clogs faster than it used to. Gravel vacuuming starts pulling up grey, fuzzy…
For most healthy adult community fish, yes: one food-free day a week does them good, and the tank good too. Wild fish rarely eat daily, and a weekly rest lets digestion clear fully while the fish forage on algae and biofilm anyway, so it is a fast from the tub rather than from all food. Pick the same day each week and…
It is a useful beginner's guardrail, not a law of fish biology: for eager surface feeders like guppies and danios it works well, stopping the most common beginner mistake of pouring in far too much. But it misleads for bottom feeders that need time for food to reach them, for grazers that feed over hours, and for shy…
Store dry fish food sealed, cool, dark, and dry — in its original container or an airtight jar in a cupboard, never on top of the tank hood where heat and humidity rise off the water. Air, light, warmth, and damp are what strip vitamins and turn the fats in flake and pellets rancid, so an opened tub quietly loses…
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