Tiny Mouths on a Sandy Floor
Baby corydoras catfish begin feeding on the tank floor, and everything about their first diet follows from that address. After hatching, fry spend roughly two days absorbing their yolk sacs while sitting on the bottom, barely moving, and food offered then simply decays around them. Once the yolk is gone they become active in miniature — shuffling along the substrate, barbels flicking, hunting particles at a scale where a normal fry crumb is a boulder. Their first real foods are live and bottom-bound: microworms, which sink and wriggle in the sand layer where the fry search, are the long-standing breeder standard for exactly this reason. Infusoria and vinegar eels suit the very smallest fry of the smaller species for the first days. The test of any food is watching the bottom after a feed — fry converging and working a patch of sand means the size and the delivery are right.
Adding Brine Shrimp and Prepared Foods
Adding baby brine shrimp moves baby corydoras growth up a gear once the fry are large enough to take them, usually within the first week. Freshly hatched shrimp that reach the bottom — many fry tanks use a small pipette to place foods directly onto the sand rather than trusting the water column — produce the visible result every fry keeper wants: rounded, slightly pink-orange bellies across the batch within the hour. Finely crumbled sinking pellets, powdered fry food, and crushed catfish wafers join the rotation as mouths grow through weeks two and three, always ground finer than looks necessary, since a corydoras fry cannot bite a piece down the way a larger fish can. By the time miniature barbels and the first adult markings show, the batch can graduate to the small sinking foods the adults eat, offered in the same patch of sand so the group learns one feeding station. Variety across the week matters less than size and placement on any given day.
Feeding Frequency and the Clean-Bottom Problem
Feeding baby corydoras through their first weeks means feeding often and cleaning just as often. Three to four small meals a day suits growing fry, each small enough to be worked over and finished rather than left to rot between the grains, because uneaten food on a fry tank floor fouls the exact layer the fry breathe and feed in. A thin layer of fine sand or a bare-bottom tank makes that cleaning possible — siphoning with airline tubing after feeds lifts waste while leaving fry undisturbed, and bare glass lets you see precisely what was eaten. Deep substrate in a fry tank is a trap twice over: food vanishes into it beyond the fry's reach, and decay builds beneath fish too small to tolerate it. Small daily water changes with matched, conditioned water complete the routine; corydoras fry are notably sensitive to the waste swings that frequent tiny feeds create, and steady water is what converts their meals into the rapid, even growth a healthy batch shows.
Reading a Batch That Is Eating Well
Reading a baby corydoras batch that is eating well is a matter of bellies and behaviour at ground level. Well-fed fry rest in a loose group rather than scattered and frantic, bellies gently convex, barbels intact and busy whenever they move, with a clear size progression visible against the grains of sand week to week. A batch that stays glassy-thin, loses fry steadily in the second week, or crowds the surface is signalling food that is too large, food that never reaches the bottom, or water failing under the feeding load — all fixable causes to check in that order before assuming disease. An experienced breeder or aquatic shop can help if losses continue after food size, delivery, and water are all corrected, and your feeding log will be the most useful thing you bring. Sharing the pipette feeds, the post-feed siphons, and the daily batch glance through KinsLe Care Teams gives this fry a rota with named owners for every round, each timestamped, so the bottom of the tank gets the attention the top never needs.