Gastromyzon ctenocephalus is a small Asian loach that lives naturally in clear, cool, highly oxygenated streams. Its flattened body and sucker-like fins allow it to cling to rocks in areas with strong currents.

A fascinating species for river tank aquariums, it requires powerful water movement and clean, oxygen-rich water. Ideal for aquarists wishing to recreate a dynamic natural biotope.

Behaviour and maintenance

• Peaceful – compatible with calm species
• Gregarious – keep in groups of at least 5 individuals
• Slightly territorial towards conspecifics (natural hierarchy)

Recommended maintenance in a specific river tank or community aquarium suitable for cool, oxygenated water.

Feeding

Algivorous / microphagous

• Biofilm and natural microalgae
• Sinking vegetable pellets
• Supplements: spirulina, poached vegetables

A mature aquarium rich in biofilm is essential in the long term.

Water quality

• Temperature: 20–25 °C
• pH: 6.5–7.5
• GH: 5–10 °dGH
• Current: Strong

Very sensitive to nitrates and lack of oxygen. Powerful filtration and continuous circulation recommended.

Decor and environment

• Numerous flat stones and pebbles
• Strong current area
• Sand + pebble substrate

Moderate lighting promoting the development of natural algae on surfaces.

Maintenance sheet

AquaBota tip

For optimal maintenance, recreate a river effect with circulation pumps and a reinforced oxygenation zone. A well-established tank with surfaces covered in natural algae ensures better adaptation.