The Hillstream Loach, scientifically known as the family Balitoridae and often referred to as the Butterfly Loach or Hong Kong Pleco, is a unique and intriguing species of fish that is native to fast-flowing streams and rivers in Asia. With their flattened bodies and specialized adaptations, Hillstream Loaches are well-suited for life in oxygen-rich, high-flow environments. Let's explore a detailed description of these fascinating fish, including essential information on their appearance, water conditions, tank mates, feeding habits, and care.

Appearance:

• Flattened Body: Hillstream Loaches have a flattened body shape with a sleek, streamlined appearance that allows them to maneuver in fast-flowing water.
• Suckermouth: They possess a distinctive suckermouth, which they use to cling onto rocks and other surfaces in their natural habitat.
• Camouflage: Hillstream Loaches often feature a mottled coloration that helps them blend in with their rocky surroundings.

Water Conditions:

• Flowing Water: Hillstream Loaches require high oxygenation and strong water flow in the aquarium to mimic their natural habitat.
• Temperature: Maintain a cooler water temperature range between 68°F and 75°F (20°C and 24°C) to replicate their native stream conditions.
• pH Level: Aim for a slightly acidic to neutral pH level between 6.5 and 7.5.
• Water Hardness: Provide a moderate water hardness level between 5 and 15 dGH.
• Filtration: Strong and efficient filtration is crucial to maintain excellent water quality and mimic the fast-flowing stream conditions.

Tank Mates:

• Peaceful Community Fish: Hillstream Loaches are generally peaceful and can be kept with other non-aggressive species.
• Compatible Tank Mates: Choose tank mates that prefer similar water conditions and have a peaceful temperament, such as small, non-aggressive fish like danios, rasboras, or small catfish species.

Feeding Habit:

• Algae Grazers: Hillstream Loaches are primarily algae grazers and feed on biofilm, algae, and small invertebrates found on rocks and surfaces.
• Supplemental Foods: Provide a varied diet that includes sinking algae wafers, vegetable-based foods, and small live or frozen foods like bloodworms or brine shrimp.

Care:

• Tank Size: Provide a spacious aquarium with a minimum length of 30 inches (75 cm) to accommodate the active nature of Hillstream Loaches.
• Current and Aeration: Use a combination of a powerful water pump or powerhead to create a strong current, and ensure proper aeration to meet their oxygenation needs.
• Decor and Substrate: Mimic their natural habitat by incorporating smooth rocks, driftwood, and a substrate of fine sand or smooth gravel to prevent injuries.
• Lighting: Moderate lighting levels are sufficient, as Hillstream Loaches prefer well-lit areas.