Almost every kuhli loach owner asks this question at some point, because the kuhli's whole lifestyle is designed to make it look like it never eats. This slender, eel-shaped loach with its bands of brown and salmon spends the day threaded through plant roots, tucked under driftwood, or half-buried in the substrate, and does its feeding at night, snuffling along the floor for morsels the daytime fish missed. A kuhli you never see at feeding time but glimpse plump and busy in the evening is not a problem fish — it is a kuhli being entirely itself.
Judge the Body, Not the Attendance
Since you cannot watch this fish eat, judge by condition instead. A well-fed kuhli has a gently rounded body along its length, smooth unbroken skin, and intact little barbels at the mouth. Seen under a dim light after dark — a torch kept brief, or the tank's own evening lighting — it should move with that loose, sinuous confidence, draping over wood and threading through plants. A kuhli that looks thin behind the head, whose bands sit on a body that seems all angles, has genuinely been missing meals, and that usually means the night floor is bare: faster bottom feeders like corydoras or a pleco may be clearing everything before the kuhlis emerge.
Make Sure Night Food Exists
Daytime feeding does a hidden loach no good at all. What matters is what remains — or is deliberately added — when the lights go out. Drop a small sinking pellet or wafer portion near the loaches' known hiding area shortly after lights-out, in a spot where the daytime fish are too sleepy to raid it. Soft sand or smooth, fine substrate matters for this species more than for most: kuhlis push their faces into the floor constantly, and sharp gravel wears barbels and invites infection. Plenty of cover matters too — a loach that must cross open ground to reach food often simply will not. Kuhlis also settle far better in a group of their own kind; a lone kuhli is usually an invisible one.
The One Time of Day to Check
Build a small night check into your routine for a few evenings. An hour after lights-out, look in with low light and watch: are the kuhlis out, moving along the floor, investigating the spot where you left food? Are they competing well, or being shouldered aside? This single observation answers the question better than a week of daytime worry. If they are out and busy, your original worry dissolves — the fish was eating on its own schedule all along. If the hiding spot stays empty night after night, or a loach emerges looking thin, then something real has changed and it deserves a proper look at water quality and tank mates.
When a Hidden Fish Needs Finding
Because kuhlis hide, illness can go unseen longer than in other fish, so act on the few signs you do get. Seek advice from an aquatic veterinarian or specialist shop if you find a loach thin and listless at night, breathing fast, showing damaged barbels or pale patches, or if one turns up dead without explanation — and check your test readings and heater before assuming disease, since a cold or dirty tank silences this whole group quietly. Tell the specialist how many kuhlis you keep and what else feeds on the floor; competition and conditions explain most kuhli problems.
The after-dark check is the one task daytime people always miss, which is why KinsLe's Care Teams lets whoever is up latest record it as a completed duty with a timestamp the rest of the household can trust.