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Kuhli Loach

Pangio kuhlii

The Kuhli Loach is a peaceful, eel-like freshwater scavenger. Highly popular for its striking orange and black bands, it requires soft sand substrates for safe, nocturnal foraging.

Taxonomy
Class:Actinopteri
Order:Cypriniformes
Family:Cobitidae
Genus:Pangio
Species:Pangio kuhlii

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Water Temperature

24 - 28 °C

pH Value

5.5 - 7

Water type

Freshwater

Tank level

Bottom

Adult size

12 cm

Minimum tank volume

60 L

Minimum group

>= 1

GH

1 - 10 dGH

KH

1 - 5 dKH

TDS

25 - 200 ppm

Conductivity

39 - 313 uS/cm

Species description

Geographical Origin and Habitat: Native to Southeast Asia, particularly Sumatra, Java, Borneo, and the Malay Peninsula. It inhabits slow-flowing forest streams, swamps, and peat bogs characterized by soft sandy or muddy substrates covered with dense layers of leaf litter, submerged roots, and decaying organic matter.
Taxonomy and Morphology: Belonging to the family Cobitidae, this species features a highly elongated, eel-like body with tiny, almost microscopic scales. Its small mouth is downward-facing and surrounded by three pairs of sensitive sensory barbels used to locate food in the substrate. Adults typically reach a length of 10 to 12 cm.
Social Behavior: Extremely peaceful, social, and shy. Kuhli Loaches are highly gregarious and must be kept in groups of at least 5 to 6 individuals to feel secure; otherwise, they will remain permanently hidden. They are primarily nocturnal and active during twilight and nighttime.
Coloration and Sexual Dimorphism: Displays a striking pattern of 12 to 17 dark brown to black vertical bands across a bright yellow to orange body. The belly is usually pale or white. Sexual dimorphism is subtle, but mature females are noticeably thicker and more round-bodied when carrying green eggs.

Care, breeding and tankmates

Aquarium Setup: A minimum tank size of 60 liters is required. It is vital to use a soft, fine sand substrate to prevent damage to their delicate barbels and skin when burrowing. Provide numerous hiding places using driftwood, caves, leaf litter, and dense live plants to simulate their natural environment.
Diet and Feeding: Omnivorous bottom feeders. In the aquarium, they will readily accept sinking pellets, flakes, and tablets, but their diet should be supplemented with live or frozen foods such as bloodworms, daphnia, and brine shrimp. Feed them after the main aquarium lights are turned off.
Water Quality: Prefers soft, slightly acidic water. The ideal parameters are a pH of 6.0 to 7.0, water hardness of 5 to 12 dGH, and a stable temperature range between 22°C and 28°C. Ensure good biological filtration and maintain moderate to low water flow.
Compatibility and Cohabitation: Excellent candidates for peaceful community aquariums. They coexist harmoniously with small tetras, rasboras, gouramis, corydoras, and dwarf cichlids. Avoid housing them with large, predatory, or overly aggressive fish that could easily mistake them for food.
Aquarium Breeding: Breeding in home aquariums is rare and usually accidental. Spawning is triggered by heavy water changes with cool, soft water. The bright green eggs are adhesive and typically deposited near the water surface on floating plants or moss. Parents do not care for the eggs.
Risks and Diseases: Because they have minimal scales, Kuhli Loaches are highly sensitive to skin parasites like Ich (white spot disease) and are vulnerable to typical aquarium medications, particularly those containing copper or malachite green, which should be used at half dosage.

Geographic Origin and Distribution

Native to Southeast Asia, particularly Sumatra, Java, Borneo, and the Malay Peninsula. It inhabits slow-flowing forest streams, swamps, and peat bogs characterized by soft sandy or muddy substrates covered with dense layers of leaf litter, submerged roots, and decaying organic matter.

Origin

Tropical oceans and reefsSouth and Southeast Asia

Fish profile

Temperament
Semi-aggressive
They are extremely shy and generally nocturnal. Without adequate hiding spots, they will stress easily and remain completely hidden. In large groups, they become much braver and more active during the day.
Diet
Omnivore
They are unfussy omnivorous scavengers. They will enthusiastically hunt down sinking pellets, frozen bloodworms, and detritus. Ensure some food actually reaches the bottom for them to find.
Sex ratio
Group
They are highly gregarious and must be kept in groups. A minimum of six individuals makes them feel secure. They do not exhibit territorial behavior toward each other.
Feeding frequency
Twice daily
Feed them once a day, ideally shortly before lights out. They forage continuously throughout the night in the substrate. Small sinking portions ensure they get their share without overfeeding the tank.
Bioload
They possess a very low bioload suitable for nano tanks. Their thin bodies do not produce significant amounts of biological waste. They actually help keep the tank clean by eating leftover food.
Flow
Stagnant
They prefer gentle to moderate flow that doesn't disrupt the substrate. A very strong current will make it difficult for them to forage comfortably. Diffused filter outputs work perfectly for their needs.
Reproduction
Oviparous
Breeding them in captivity is rare but occasionally happens by accident. They scatter bright green eggs among dense vegetation or roots. Specific triggers are poorly understood, but mature heavily planted tanks offer the best chance.
Compatibility & tankmates
They are exceptionally peaceful and harmless to all fish. They thrive in community tanks with small, non-aggressive species. Large cichlids will easily view these small loaches as a quick snack.
Tank level
Bottom
They strictly inhabit the bottom of the aquarium. They spend their time burrowing into soft sand or hiding under leaf litter. You will almost never see them swimming near the surface.

Window to the official scientific data of the species

Data synced on: 06/15/2026

Scientific Parameters & Models

Trophic level
3.6 ± 0.4 se
Resilience
Medium (1.4 - 4.4 years)
Generation time
3 years
Phylogenetic uniqueness (PD50)
0.5
Bayesian Length-Weight
a = 0.00501, b = 3.08
VulnerabilityLow to moderate vulnerability (30 / 100)

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

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Last updated: 06/30/2026