A slim, eel-shaped, banded loach that burrows and forages along the bottom of soft-substrate tanks. Secretive and nocturnal, kuhli loaches are peaceful, long-lived, and most comfortable in groups.
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Slender, eel-like loach reaching about 8-10 cm (3-4 in) long, though most stay near 8 cm (3 in).
Lifespan
7–12 years
Social needs
group
Native region
Southeast Asia (Malay Peninsula, Sumatra, and Borneo; note that most trade 'kuhli loaches' are actually Pangio semicinct
Origin
Old World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Cobitidae
Genus
Pangio
Part of the Loaches
Bottom-dwelling, often social fish prized for sifting substrate, controlling pest snails, and adding constant motion to the lower levels of the aquarium. Most are scaleless or fine-scaled and sensitive to medications.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Small group in soft sand
20 gal long / 75 L (group of 5+)
Kuhli loaches are nocturnal, social, eel-shaped fish that bury themselves — fine sand substrate is non-negotiable. Keep at least 5 in a securely lidded tank with gentle filtration and 24–28 °C soft water.
Photo coming soon
Recommended
Mature blackwater community
29–40 gal / 110–150 L
Group of 6–8 in a planted tank with driftwood, leaf litter, and many low hides. They writhe around each other when secure — sparse decor leaves them perpetually hidden.
Photo coming soon
Ideal
Heavily planted biotope
55 gal / 200 L biotope
Large mature blackwater setup with tannins, deep sand, dense planting, and a school of 10+. Activity and out-in-daylight behaviour increase dramatically with numbers and cover.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
Keep a group of at least six in a tank of 75 litres (20 US gal) or larger with plenty of floor space. A soft sand substrate is essential, as kuhlis burrow and dig; sharp gravel injures them and discourages natural behavior. Provide dense planting, driftwood, leaf litter, and caves so they feel secure, and ensure the tank is tightly covered because they are escape artists that probe filter intakes and gaps.
They are tropical and prefer soft, slightly acidic water: 24-28 C (75-82 F), pH 6.0-7.0, soft to moderately soft, with gentle flow and pristine conditions. As scaleless, sensitive fish they need a fully cycled, stable tank and slow acclimation. Sponge-guard intakes to prevent these slim fish from being sucked in or escaping.
Substrate
Soft, fine sand is essential because these eel-like loaches burrow and sift, and sharp gravel can injure their delicate skin and barbels. A bare or sandy bottom with leaf litter mimics their natural stream beds.
Equipment & setup
A heater at 75-86F and gentle filtration suit them; ensure the filter intake is screened, as they can wriggle into uncovered intakes. Subdued lighting with plenty of cover encourages them to come out rather than stay permanently hidden.
Diet
Omnivorous bottom-foragers that eat sinking pellets and wafers, frozen or live bloodworms, blackworms, daphnia, and brine shrimp, plus some plant matter and biofilm. They sift the substrate for food and benefit from sinking foods offered after lights-out when they are most active.
Feed in the evening so the nocturnal kuhlis get their share, and make sure quicker mid-water fish do not eat everything first. A varied diet with regular meaty foods keeps them in good condition. They are not algae-eaters and should not be relied on to clean the tank.
Behavior & temperament
Peaceful, social, and secretive, kuhli loaches spend the day hidden in substrate, plants, or caves and emerge to forage at night or in dim light. In good-sized groups they become bolder and more active, sometimes 'dancing' through the water column together. They are completely harmless to tankmates.
Enrich with soft sand for burrowing, leaf litter, dense plants, driftwood, and plenty of caves; the more hiding spots, the more confident and visible they become. Subdued lighting and a planted, well-decorated tank bring out their natural foraging and burrowing. They suit peaceful community tanks with small, calm species.
Health
As scaleless loaches they are very sensitive to medications (especially copper and salt), poor water quality, and rough substrate. Use only fractional doses of treatments and keep parameters stable. Sharp gravel and dirty sand cause barbel and skin damage and infection.
They are susceptible to ich and skin/barbel infections, and to injury or loss from being sucked into unguarded filter intakes or escaping an open tank. Quarantine new fish, guard intakes, keep the lid tight, and provide soft substrate and excellent water quality to prevent most problems.
Tips, DIY & hacks
Provide abundant hides -- PVC tubes, driftwood tangles, caves, and dense plants -- since they feel safe in groups and burrows. Keep at least 5-6 together; they are nocturnal, so sinking foods dropped at lights-out ensure they get fed.
