The Borneo Loach, also known as the Hillstream Loach or Butterfly Loach, scientifically classified as Sewellia lineolata (or Gastromyzon spp. depending on the variety), is a unique freshwater fish belonging to the Balitoridae family. Native to the fast-moving, highly oxygenated streams of Borneo, these fish are well-known for their flattened, disc-like bodies that allow them to cling to rocks and substrates in their natural habitat. The Borneo Loach’s distinctive appearance, along with its peaceful nature and algae-grazing habits, makes it a popular choice for aquarists with a focus on well-oxygenated tanks. Typically, Borneo Loaches grow to about 2-3 inches (5-7 cm) in length and can live for 5-7 years in captivity with proper care.
Habitat and Tank Requirements:
In the wild, Borneo Loaches are found in cool, fast-moving streams with plenty of rocks and crevices. They thrive in well-oxygenated environments with high water flow and require specific conditions to replicate their natural habitat in a home aquarium.
Tank Size and Water Parameters:
| PARAMETER | RECOMMENDED |
|---|---|
| Tank Size | Minimum 60 litres |
| Temperature | 68-75°F (20-24°C) |
| pH | 6.5-7.5 |
| Hardness | Soft to moderately hard water, 5-12 dGH |
| Flow | High water flow and strong oxygenation |
This table provides the ideal water conditions for keeping Borneo Loaches healthy and active. These fish thrive in tanks that replicate fast-flowing streams, making a powerful filter or powerhead essential to create the necessary water movement.
Borneo Loaches prefer a tank with a smooth substrate like sand or fine gravel, as well as plenty of rocks and driftwood, which serve as hiding spots and grazing surfaces for algae. Since they are excellent at clinging to surfaces, a well-structured tank with ample decorations will provide them with the necessary spaces to explore and feed. Live plants can be included, but they should be secured well due to the water flow these fish prefer. It’s also essential to maintain high oxygen levels in the tank, either by using a strong filter or an air stone.

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