Decorating for kuhli loaches means designing a tank you will often appear not to own fish in. These eel-like bottom dwellers spend daylight hours hidden in a communal tangle, then emerge at dusk to sift the floor, and the cover you provide decides whether you see that evening activity or nothing at all. A loach that trusts its hiding places explores; one that does not stays buried and stressed.
Sand first, because they live in the floor
The single most important decor decision is the substrate. Soft, fine sand lets kuhlis push their snouts in, sift for food particles, and half-bury themselves, which is normal resting behaviour. Sharp gravel risks scraped bellies and damaged barbels, the small feelers around the mouth they taste the floor with. Keep the sand layer modest so waste does not compact deep inside it, and stir the open areas lightly during water changes while leaving the covered corners alone.
A tangle, not a single cave
One cave houses one anxious loach; a tangle houses a group. Layer driftwood pieces so they lean and overlap, stack smooth rounded stones with gaps between them, and add a halved coconut shell, a short ceramic tube, or two openings into the same sheltered pocket. Kuhlis like to drape and pile over each other in these spaces, so several snug entrances into shared shade beat a row of separate ornaments. Dried leaves scattered over the sand complete the floor, giving them litter to nose through exactly as they would on a stream bed.
Check every decor edge with a fingertip and every hollow for trapped-air pockets or narrow ends a long body could enter and not reverse out of. Position the main tangle where you can see into its front edge from your usual seat, because that is where loaches will drape at dusk.
Plants that cast shade and survive digging
Choose plants that grow on wood or stone rather than in the floor: Java fern and anubias attached high on the driftwood cast the shade kuhlis prefer and cannot be uprooted by burrowing. Java moss threaded through the tangle softens entrances and traps fine food particles the loaches pick out later. Floating plants overhead dim the whole tank and noticeably increase daytime appearances. Delicate carpeting plants are a poor match, since nightly digging loosens them faster than they can root.
Feeding and viewing a shy fish
More cover means more loaches on show
It sounds backwards, but the route to seeing kuhli loaches is giving them more places not to be seen. A group of six or more sharing a deep tangle will drape at its edges in the evening, thread through the leaf litter after food, and even appear in dim daylight once the tank has been stable for a while. A pair alone in a neat tank with one ornament usually vanishes entirely. Blue-toned evening light, or simply the room light after the tank light goes off, is prime viewing time, and a few nights of watching from the same chair teaches you which entrance each cluster prefers.
Drop sinking food near the tangle's front entrance after lights dim, and watch from a little distance for the first minutes. Count heads at the tangle weekly if you can, because a loach can hide through several feedings before anyone realises it is missing. Recording the tangle layout and each shelter's location in KinsLe Family Sharing means a family member cleaning the tank knows to lift every piece slowly and check the sand beneath it.