Butterfly Hillstream Loach

Butterfly Hillstream Loaches are primarily herbivores that graze constantly on biofilm, periphyton, and soft algae growing on rocks and glass. Supplement their diet with blanched zucchini, spinach, spirulina wafers, and sinking algae tabs 2-3 times per day. Occasional offerings of small live or frozen foods such as baby brine shrimp or daphnia are accepted and beneficial.

These loaches are active, peaceful fish that spend most of their time clinging to hard surfaces and grazing, using their sucker-like mouths and flattened bodies to navigate strong currents. Males can be mildly territorial with one another, so keeping them in groups of three or more with ample space reduces aggression. They are most active during daylight hours and are highly entertaining to observe as they dart across rocks and glass.

Breeding in captivity is possible but challenging, requiring pristine, highly oxygenated water with strong flow and a significant temperature drop to simulate seasonal changes. Males will court females by nudging and displaying, and eggs are deposited in crevices or under flat rocks. Fry are tiny and require biofilm-rich surfaces and very fine foods such as infusoria or commercial fry foods.