Species · Catfish & bottom-dwellers
Kuhli Loach
Pangio kuhlii
The little eel-like loach that hides by day and comes alive at night — peaceful and quirky, but it needs a group, soft sand to burrow in, and no gaps to escape through.
Difficulty: Beginner–IntermediateTropical community tank✓ Fact-checked care guide
Quick facts
| Adult size | ~10 cm / 4 in |
|---|---|
| Minimum tank | ~55 L / 15 US gal — SeriouslyFish recommends a 60 × 30 cm base |
| Temperature | 23–26 °C / 73–79 °F (within the species range of 21–26 °C / 70–79 °F) |
| pH | 4.0–7.0 (soft, acidic to neutral) |
| Hardness | 0–8 dGH (soft water) |
| Filtration & flow | Cycled, gentle filtration; smooth sand substrate essential |
| Diet | Omnivore bottom-feeder — sinking foods, plus live/frozen; it needs its own food |
| Social | Social — keep a group of at least 4–6 |
| Temperament | Very peaceful and shy |
| Lifespan | 5–10 years |
Overview
The kuhli loach is a slender, eel-like, peaceful bottom-dweller — a quirky, charming fish that spends the day hidden and emerges at dusk to forage. (Most "Pangio kuhlii" in shops are actually P. semicincta; care is the same.)
It is easy and long-lived, asking for three things people often miss: a group, soft sand to burrow in, and a tank with no gaps — kuhlis are escape artists.
Water & tank
Kuhlis come from soft, acidic forest streams, so they prefer soft, slightly acidic-to-neutral water (pH 4.0–7.0, 0–8 dGH) at 23–26 °C / 73–79 °F. Give them soft sand (they burrow) and plenty of cover — wood, plants, leaf litter.
They're happiest in a group of 4–6+ in ~55 L / 15 US gal or more, and the tank must be well-covered: kuhlis slip through surprisingly small gaps, including filter intakes (use a guard).
Feeding
An omnivore that forages the substrate — it needs its own sinking food (pellets, wafers) plus live/frozen treats (bloodworm, daphnia); don't rely on leftovers. Feed after lights-out when it emerges.
Behaviour & tankmates
Peaceful with everything and a great community bottom-dweller. Keep a group or it hides constantly; in a confident group they come out far more, even by day.
Suit calm tankmates; avoid anything large or aggressive.
What to expect
Expect to see little at first — a new or lone kuhli hides almost entirely. With a group, cover, and sand, they gradually become bolder and are wonderful to watch snuffling through the substrate.
Myths, kindly busted
“One kuhli loach is fine.”
They are social — a lone kuhli hides permanently; keep a group of 4–6+ to see natural, confident behaviour.
“Any substrate works.”
They burrow and have delicate skin/barbels — use soft sand, not sharp gravel, and cover all gaps (they escape).
When to act
We triage, not diagnose — but these are worth a closer look (starting with a water test):
- A kuhli constantly hidden even at night — usually too small a group or too little cover.
- A missing loach — check for escapes and cover gaps/filter intakes; test water if one is lethargic or off food.
Sources & further reading
- SeriouslyFish — Pangio semicincta (kuhli loach) — Adult ~100 mm SL; 60 × 30 cm base; temperature 21–26 °C / 70–79 °F; pH 4.0–7.0; hardness 0–8 dGH (soft); peaceful, social; burrower needing soft sand; the species usually sold as "kuhli loach".
Written & fact-checked by The Finfern Team against the sources above — kind, general guidance, not a diagnosis. If something looks wrong, test your water and, if it persists, contact a fish-savvy vet.
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