Hara jerdoni is a miniature catfish native to fast-flowing, rocky hillstreams in northeastern India and Bangladesh, where it clings to rocks and substrate using its flattened body and pectoral fins adapted to strong current. Its mottled brown and tan coloration provides exceptional camouflage against substrate, rocks, and leaf litter — making it nearly invisible even in the aquarium until it moves.
This species is truly tiny, with adults rarely exceeding 3.5 cm. It belongs to the family Erethistidae, a group of small Asian torrent catfish that are adapted to high-oxygen, fast-moving water. In the aquarium, it prefers cooler temperatures between 15–22°C, making it suitable for unheated or lightly heated tanks in temperate climates, or specialized hillstream setups.
The Asian Stone Catfish is nocturnal and peaceful, spending the day motionless on surfaces and becoming more active after dark. It poses no threat to any tankmate and is actually more vulnerable to being harassed than vice versa. It is best suited to a species-only setup or a quiet nano tank with very small, peaceful companions. Its small size means even tiny invertebrates like dwarf shrimp are safe neighbors. The species is also notable among nano fish enthusiasts for its exceptionally small minimum tank size requirements, making it one of the few catfish appropriate for true nano setups of 20–40 liters. Its preference for cool, flowing water makes it a natural companion for temperate biotope setups featuring White Cloud Minnows, Danio margaritatus, or other cool-water species from similar highland habitats.
