Leftovers are not a diet
The commonest bottom-feeder mistake is an assumption: that what the surface fish miss will feed the fish below. What actually reaches the substrate is the least nutritious fraction, soaked fragments and dust, minus everything the mid-water fish pick off on the way down, and it arrives in no predictable amount. Corydoras, loaches, plecos and bottom-dwelling catfish have real appetites and, in a stocked community tank, real competition. A bottom feeder expected to live on fallout slowly thins while the tank above it thrives. Their food has to be chosen for them, sized for them and delivered to the floor of the tank as a deliberate feed, exactly as any other fish's is.
Choosing and placing sinking food
Match the food to the mouths: small sinking pellets or granules for corydoras and smaller loaches, wafers for the rasping and grazing species, and thawed frozen foods for the carnivorous bottom hunters. Drop it onto open substrate in the area the fish actually use, in front of the cave, along the front glass where the corys parade, beside the driftwood, not broadcast over the tank, where pieces lodge in plants and decay unfound. If faster fish have learned to dive on sinking food, feed the bottom after lights-out, or sink the food through a short length of pipe or with a pipette so it lands precisely where the surface fish are not looking. Several small deposits beat one pile, which a single bold fish can sit on and defend.
Timing feeds for the night shift
Many bottom feeders keep nocturnal hours by instinct. Corys grow livelier as the light fades, loaches emerge at dusk, and most plecos barely move until dark. A bottom feed given at midday is a gift to the day shift; the same feed given in the last minutes of light belongs to its intended eaters. Splitting the bottom ration works well: a small portion with the main feed so you can watch it eaten, and the rest after lights-out. Watching matters most with new fish. A bottom feeder that comes out confidently and works the substrate with quick, busy movements is feeding well; one that hides through both feeds needs its food placed closer to its shelter.
Checking bellies from below
Verify the result on the fish themselves. A well-fed corydoras shows a softly rounded belly from the side and looks plump from above, with intact barbels from working clean substrate. Loaches should look filled along the body rather than pinched behind the head, and a pleco's belly, seen when it clings to the glass, should be flat to gently rounded: a sunken, hollow belly on the glass is a fish that is not getting enough, whatever the feeding routine claims. Photograph the group monthly if bellies are hard to judge. If one species fades while the others thrive, its food type or timing is wrong for that fish, not for the whole tank. Once the evening feed and its placement are written into KinsLe Care Teams, every feeder sends food to the bottom on schedule, and the night shift stops relying on luck.