Double Red Tail Hillstream Loach
Gastromyzon sp.
Add a rare and eye-catching gem to your freshwater aquarium with the Double Red Tail Hillstream Loach (Gastromyzon sp.). Known for its striking twin red tail lobes and streamlined body, this peaceful bottom-dweller is a standout species from the fast-moving streams of Borneo. It’s an excellent addition to planted and river-style aquariums, especially for hobbyists who appreciate unique, algae-grazing fish with specialized care needs.
Scientific Name: Gastromyzon sp.
Common Name: Double Red Tail Hillstream Loach
Origin: Borneo, Southeast Asia
Size: Up to 2.5 inches (6.3 cm)
Lifespan: 5–7 years
Temperament: Peaceful and shy; best kept in groups
Diet: Herbivorous – grazes on biofilm, soft algae, and accepts sinking wafers and blanched vegetables
Tank Role: Algae cleaner and active bottom-dweller
Minimum Tank Size: 20 gallons
Tank Setup: River-style layout with strong water flow
Substrate: Smooth rocks, pebbles, and fine sand
Aquascaping: Plenty of flat surfaces for grazing; hiding spots with driftwood or caves
Lighting: Moderate to bright (encourages algae growth)
Temperature: 68–75°F (20–24°C)
pH: 6.5–7.5
Hardness: 4–12 dGH
TDS: 100–250 ppm
Oxygenation: High – requires well-aerated, clean water with steady current
The Double Red Tail Hillstream Loach thrives in mature, oxygen-rich aquariums with stable water conditions. Mimicking its natural habitat with strong currents and rock surfaces helps ensure its health and comfort. These loaches prefer to live in groups of three or more and should not be kept in newly established tanks due to their sensitivity.
Graceful, rare, and functional, the Double Red Tail Hillstream Loach brings color, character, and algae control to your freshwater aquarium. A must-have for experienced aquarists seeking a truly special species.
