The butterfly hillstream loach, scientifically known as Beaufortia kweichowensis, is a freshwater fish popular among aquarists. Its common name is derived from its unique, flattened body shape and broad, wing-like pectoral and pelvic fins. These specialized fins allow the loach to firmly cling to submerged rocks and surfaces in its natural habitat of fast-flowing, oxygen-rich rivers and streams. This adaptation makes the butterfly hillstream loach a specialized addition for replicating its unique aquatic environment.
Ideal Aquarium Environment
Replicating the loach’s swift-flowing habitat supports its health. A strong water current and high oxygenation are necessary for these fish. Aquarists can achieve this by using powerheads, wavemakers, or filters with high turnover rates, providing 10-15 times the tank volume per hour. A minimum tank size of 20 gallons is recommended for a small group, with longer tanks preferable to taller ones.
The substrate should consist of fine sand or smooth gravel. Incorporating numerous smooth, flat rocks and stones is beneficial, as these surfaces encourage the growth of biofilm and algae. Driftwood can also be added, but ensure it does not disrupt the water flow. Providing ample hiding spots among the rocks and decor helps reduce stress and territorial disputes among individuals.
Water Parameters and Maintenance
Maintaining stable water parameters is important for their health. They thrive in cooler water temperatures, ranging from 65°F to 75°F (18°C to 24°C). While they can tolerate slightly higher temperatures temporarily, this requires increased dissolved oxygen levels. The pH level should be kept in a neutral to slightly alkaline range, between 6.5 and 8.0.
General hardness (GH) should fall within 4-12 GH. These fish are sensitive to poor water quality and accumulated organic waste, making a well-cycled aquarium necessary. Consistent weekly water changes of 30% are recommended to maintain clean conditions and low nitrate levels. Regular testing of ammonia, nitrite, and nitrate levels is advised to ensure water quality remains suitable.
Diet and Feeding
In their natural environment, butterfly hillstream loaches primarily graze on biofilm and algae. To replicate this diet in an aquarium, offer high-quality sinking foods. Suitable options include algae wafers, spirulina-based foods, and gel foods such as Repashy Soilent Green.
Blanched vegetables like zucchini, spinach, kale, or cucumber slices can also be offered. While primarily herbivorous, their diet can be supplemented occasionally with frozen or live foods such as bloodworms, daphnia, or brine shrimp. It is important to avoid overfeeding protein-rich foods, as an excess can lead to health problems.
Behavior and Suitable Tank Mates
Butterfly hillstream loaches are peaceful fish, making them suitable for community aquariums. They are more active when kept in groups of three or more, which reduces stress and encourages natural behaviors. While not aggressive towards other species, males may exhibit territorial behavior towards each other over preferred grazing spots. Providing ample flat surfaces and hiding places helps to distribute these minor squabbles.
Selecting appropriate tank mates involves choosing fish that share similar requirements for high water flow, cool temperatures, and high oxygenation. Good companions include:
Other hillstream loach species
White Cloud Mountain Minnows
Zebra Danios
Various small rasboras
Tetras that can tolerate current
Dwarf shrimp and snails are also compatible. Avoid keeping butterfly hillstream loaches with slow-moving, long-finned fish like Bettas or Angelfish, or large, aggressive, and predatory species such as certain cichlids, as these are incompatible.