Yellow Finned Hillstream Loach (Gastromyzon viriosus)

Yellow-Finned Hillstream Loach (Gastromyzon viriosus)

The Yellow-Finned Hillstream Loach is a fascinating freshwater species known for its flattened body, bright yellow fins, and unique ability to cling to rocks and glass using its powerful suction-cup-like fins. Native to the fast-flowing streams of Borneo, these peaceful fish thrive in cool, highly oxygenated aquariums with strong water movement.

Their constant grazing behaviour makes them a favourite among aquarists looking for both a unique display fish and a natural algae grazer.

Quick Facts

• Scientific Name: Gastromyzon viriosus
• Common Name: Yellow-Finned Hillstream Loach
• Origin: Borneo
• Adult Size: 2–3 inches (5–7.5 cm)
• Lifespan: 5–8 years
• Temperament: Peaceful
• Care Level: Intermediate

Aquarium Requirements

• Minimum Tank Size: 20 gallons
• Temperature: 68–76°F (20–24°C)
• pH: 6.5–7.8
• Water Hardness: Soft to moderately hard
• Aquascape: Smooth rocks, rounded river stones, driftwood, and strong water flow with excellent filtration and high oxygen levels. A mature aquarium with natural biofilm and algae is ideal.

Diet

Yellow-Finned Hillstream Loaches are omnivorous grazers. While they enjoy grazing on algae and biofilm, they should also be offered high-quality algae wafers, sinking herbivore pellets, Repashy gel foods, frozen foods such as bloodworms and daphnia, and blanched vegetables like zucchini or spinach.

Compatibility

• Best kept singly or in small groups if the aquarium provides plenty of space and hiding places.
• Excellent tank mates for peaceful community fish such as danios, white cloud mountain minnows, rasboras, small rainbowfish, Corydoras, and other peaceful loaches.
• Can coexist with shrimp and snails in most aquariums.
• Avoid keeping them with aggressive or large predatory fish.

Why You’ll Love Them

• Unique flattened body designed for life in fast-flowing streams.
• Beautiful yellow fins and intricate body patterns.
• Excellent algae and biofilm grazer.
• Peaceful and full of personality.
• A fascinating addition to river-style and planted aquariums.

The Yellow-Finned Hillstream Loach is an exceptional choice for aquarists looking for something truly unique. With their eye-catching appearance, peaceful temperament, and constant grazing behaviour, they make a fantastic addition to mature, well-oxygenated freshwater aquariums. Contact ECOAquariums for current availability and pricing.