The direct answer for an ageing kuhli loach
An ageing kuhli loach eats best when dinner is brought to its door, after dark. This slender, eel-like fish spends its senior days threaded under driftwood or curled inside a cave, emerging less boldly and travelling less far than it did when young. Food scattered at lights-out across open substrate is found first by every other bottom-feeder in the tank. Placing softened sinking food at the entrance of the loach's actual hideout, using a feeding tube or baster so the pieces land precisely, gives this fish a meal it can take without a journey or a contest. One small delivery, at the same hideout, every night, is the whole secret.
Why old kuhli loaches fade quietly
Kuhli loaches are shy at every age, and age deepens the habit. An older loach that once looped around the tank on barbel-led exploration now conserves itself, staying close to cover and venturing out mainly in darkness. Its tankmates do not share that schedule. Corydoras, snails, and shrimp work the substrate through the evening and strip dropped food long before the loach's midnight round. Because a kuhli is thin by design, keepers misread genuine weight loss as normal shape until the fish looks pinched behind the head. The invisibility that makes this species charming is exactly what lets an ageing one under-eat unnoticed for weeks.
Delivering food to the hideout entrance
Learn which cave, wood tangle, or leaf pile your loach actually sleeps in — not the ornament you intended for it, the one it chose. After the lights go out, guide a feeding tube to that entrance and release a few softened micro pellets or a pea-sized wafer fragment so they settle right at the threshold. A red or dim light lets you confirm the loach emerges and feeds without startling it back into hiding. If several kuhlis share the tank, make a small delivery at each known hideout rather than one generous pile, because the boldest loach will otherwise eat every share, including the senior's.
Substrate and surroundings that protect an old loach
A kuhli loach's skin is smooth and effectively scaleless, and an ageing fish drags its belly over the same routes nightly. Keep the ground around its hideout as soft, fine sand, free of sharp gravel edges and accumulated waste that irritate that skin during foraging. Pre-soaking food matters here too: a softened pellet can be sucked apart gently, while a hard one gets abandoned after a few attempts. Check in the morning for untouched food at the threshold; leftovers mean the portion was too large or the delivery spot is wrong, and reducing the amount protects water quality around a fish that breathes that bottom layer all day.
The signs that mean a vet, not more food
Seek a vet if your ageing kuhli stops emerging even for food placed at its door, because refusal at the threshold is a serious change in this species. Visible thinning along the body, pale or broken banding, frayed barbels, or scratching against objects all warrant professional assessment. A loach that hangs at the surface or breathes rapidly is an urgent case, not a wait-and-see one. Take a note of when night feeding last succeeded and what was offered. Recording those night-feeding results in KinsLe's Pet Passport keeps this loach's quiet history readable at a glance when a vet needs the full picture.