Bottom Feeders With a Hunter's Instinct
Corydoras spend their lives nose-down, working the substrate in loose, social groups, whiskers — their barbels — tasting the ground ahead of them for insect larvae, tiny worms and fallen scraps. They are omnivores, but the animal side of that menu matters: protein-rich finds are what a cory is hunting for as it sifts. A flake-only diet fails them logistically before it fails them nutritionally, because flakes are intercepted at the surface by faster fish and the corys inherit fragments. Variety, for corys, starts with food that is guaranteed to arrive where they live.
Sinking Staples That Reach the Bottom
Make sinking food the foundation: small pellets or mini wafers formulated for bottom feeders, sized for a modest mouth, dropped in enough places that the whole group eats simultaneously. Scatter rather than pile — corys in the open will feed confidently together, while a single pellet mobbed by six fish feeds only the boldest two. Sand or smooth fine substrate suits this feeding style best, letting the fish sift without wearing their barbels down on sharp gravel, and intact barbels are themselves a good health indicator.
Animal Foods: The Heart of the Rotation
Thawed frozen bloodworms are the single best variety food for corydoras — sunk to the bottom, they provoke an immediate, excited foraging response as each fish hoovers its patch. Rotate frozen daphnia and finely chopped earthworm-style foods where available, plus occasional live foods such as microworms or baby brine shrimp for young fish. Offer these animal foods several times a week alongside the staple, in portions the group clears within a few minutes, because bloodworms left uneaten decay fast on the substrate.
Timing and Group Behaviour
Corydoras forage most confidently as light fades, so schedule their main feed for the evening, after the mid-water fish have had their ration and are slowing down. In a group — and corys should always be kept in a group — the shy individuals feed more boldly when surrounded by relaxed tank mates already eating. Watch the group rather than the species average: one cory that hangs back, thin while the others round out, needs its food placed at its own end of the tank for a while.
Signs the Menu Needs Attention
Worn or shortened barbels, a hollow belly, or a group that sits listless instead of foraging point first to the substrate and water quality, and then to whether food is genuinely reaching them. Corys that gasp at the surface repeatedly or lose condition despite sinking food arriving nightly deserve a water test and, if things do not improve, an aquatic veterinarian's opinion, since bottom dwellers meet deteriorating water first. Recording the sinking staple, the bloodworm days and the evening timing in KinsLe Care Teams keeps every feeder treating the corys as a group to be fed deliberately.