The Gastromyzon viriosus (Yellow-Finned Hillstream Loach) is a rare freshwater loach native to the fast-flowing mountain streams of Borneo. Known for its suction-cup body and vivid yellow fins, this peaceful bottom-dweller is the ultimate addition to any high-flow river biotope setup.
Technical Specifications:
Scientific Name: Gastromyzon viriosus (Tan, 2006)
Common Name: Yellow-Finned Hillstream Loach / Borneo Sucker
Origin: Borneo Island (Tatau River Basin, Malaysia)
Adult Size: 2.0 to 2.2 inches (5.0 cm to 5.5 cm)
Temperature: 68 °F to 75 °F (20 °C to 24 °C)
pH Range: 6.5 to 7.8
Water Hardness: 2 to 12 dGH
Flow & Oxygen: High to Very High. Requires strong current powerheads and high dissolved oxygen.
Appearance: Ventrally flattened body designed to suction onto smooth surfaces. Features a dark pattern with bright yellow fins.
Activity & Behavior: Extremely peaceful community fish. Constantly grazes on biofilm and algae across rocks and tank glass.
Diet: Biofilm & Algae Grazer. Accepts spirulina wafers, daphnia, and small frozen micro-foods.
Breeding: Unrecorded / Extremely rare in home captivity.