A kuhli loach experiences the tank through hiding places, so enrichment for this banded, eel-shaped fish means building a floor it can vanish into. Indoors, a kuhli loach spends daylight threaded through leaf litter, buried in sand with just its head out, or tangled asleep with several tankmates inside one cave. Give it that layered, shadowy bottom and the fish becomes bold at dusk; keep it on bare gravel with nowhere to go and you may not see it for weeks.
Sand a kuhli loach can bury itself in
A kuhli loach digs, and the substrate decides whether that instinct gets used. Fine soft sand lets the fish dive headfirst and disappear completely, which is a resting behaviour, not a problem to fix. Coarse or sharp gravel blocks burrowing and can irritate the soft underside and whiskers the kuhli uses to taste its way along the floor. Keep the sand layer deep enough in at least part of the tank for a full burial, and smooth any stone or wood edges sitting on it, because a startled kuhli wedges into the first gap it finds when it bolts.
Hides that hold the whole kuhli group
A kuhli loach is social in a very physical way: several fish rest in direct contact, coiled together in the same shelter. Provide more low hides than the group strictly needs — short tubes, half caves, dense wood tangles and piles of smooth pebbles with gaps between them — so the whole group can share one and still have spares when a bigger tankmate claims a spot. Spread the shelters across the tank rather than clustering them, and the kuhlis will commute between them at night. One decorative cave in an open tank mostly teaches a kuhli to never leave it.
Leaf litter turns the floor into a foraging field
A kuhli loach hunts by scent and touch among fallen leaves, so a scattering of dried leaves over the sand is working enrichment, not untidiness. The leaves create a maze of edges and pockets where tiny food settles, and the kuhlis spend the evening threading through it mouth-first. As leaves soften and break down they also shelter the microscopic life these fish pick at between feeds. Replace them gradually, a few at a time, so the floor's layout changes slowly instead of being stripped and reset in one cleaning session.
Feed the night shift, then use dim light
A kuhli loach fed only in bright light with fast tankmates often gets almost nothing. Drop small sinking foods near the shelters shortly before or after the lights go down, in two or three spots so the group does not have to crowd one pellet. A dim evening viewing light rewards patience: within the hour the kuhlis usually emerge, looping over the litter in loose procession. If a kuhli stops emerging at night, loses its plumpness, or shows worn whiskers, check the substrate and water first and seek an aquatic vet's input if the change persists, because bottom fish often show tank problems earliest. KinsLe Family Sharing helps here by keeping one shared kuhli profile where the household logs hide positions, leaf changes and night feeds, so nobody helpfully tidies away the shelters these fish depend on.