The Hillstream Loach (Sewellia lineolata) is one of the most fascinating and unique freshwater fish in the aquarium hobby. Recognized for its striking “stingray-like” body shape, intricate patterning, and strong algae-eating ability, the Hillstream Loach fish is both beautiful and beneficial. These peaceful bottom dwellers help maintain a clean tank by grazing on biofilm and algae, making them a perfect addition for aquarists who value both function and style in their aquarium. Native to the fast-flowing mountain streams of Vietnam, China, and Southeast Asia, the Hillstream Loach thrives in cool, oxygen-rich environments. Their flattened bodies and strong fins allow them to cling to rocks and resist powerful currents. In aquariums, they are best known for their unique appearance, gentle nature, and efficiency as natural algae eaters, a role that makes them a favorite among planted tank enthusiasts. A full grown Hillstream Loach typically reaches 2.5–3 inches (6–7.5 cm) in length. They feature a flattened, disc-like body with intricate maze-like patterns of dark brown and yellow-gold. Their undersides have a sucker-shaped mouth adapted for grazing on rocks and glass. When kept in well-oxygenated water, their colors intensify, showcasing the true beauty of this species. Hillstream Loaches are peaceful, bottom-dwelling fish that coexist well with other calm freshwater species. Ideal Hillstream Loach tank mates include Tetras, Rasboras, White Cloud Mountain Minnows, Danios, Corydoras catfish, and small shrimp. Avoid aggressive or territorial fish that may outcompete them for food or disturb their calm environment. They prefer living in groups of three or more to display natural schooling and grazing behaviors. At our Splashy Fish tropical fish store, our Hillstream Loach for sale and other freshwater fish for sale are carefully selected and packed with love! Visit us to buy them online or at our aquarium store in Virginia for more betta fish for sale, freshwater shrimp for sale, live aquatic plants for sale, and aquarium supplies. WHAT YOU CAN EXPECT FROM THIS FISH: Striking appearance resembling a miniature freshwater stingray Excellent algae eater that helps maintain tank cleanliness Peaceful and community-friendly species Ideal for planted and cool-water aquariums Thrives in groups and active in high-oxygen environments RECOMMENDED TANK PARAMETERS: Tank Size: Minimum 30 gallons for a small group Temperature: 68°–75°F (20°–24°C) (ideal Hillstream Loach temperature) pH: 6.5–7.5 Hardness: 5–15 dGH Filtration: Strong flow and high oxygenation with smooth rocks or river stones CARE GUIDELINES: Diet: Primarily herbivorous. Feed with high-quality algae wafers, sinking pellets, blanched vegetables (zucchini, spinach), and occasional protein sources like bloodworms or brine shrimp. Tank Setup: Mimic a mountain stream with smooth stones, pebbles, and high water flow. Provide shaded areas with driftwood or caves for resting. Behavior: Peaceful, social, and most active during the day. Loves grazing on surfaces for algae and biofilm. Visit here to explore more about How to Care for Loach Fish. Hillstream Loach Frequently Asked Questions (FAQs) How many Hillstream Loach should I keep together? It’s best to keep Hillstream Loaches in groups of at least 3 to 6 individuals. These social bottom-dwellers are more active and display natural behaviors when kept together. In groups, they form small territories, graze on algae, and interact peacefully. Keeping multiple Hillstream Loach fish also helps reduce stress and ensures they remain healthy and active in the aquarium. How long do Hillstream Loach live? With proper care, a Hillstream Loach can live for 8–10 years in a well-maintained aquarium. Consistent water quality, a strong current, and cool, oxygen-rich conditions are essential for longevity. A balanced diet of algae wafers, sinking pellets, and blanched vegetables also helps extend the Hillstream Loach lifespan and keep their vibrant patterns bright. Are Hillstream Loach hard to keep? Hillstream Loaches are moderately easy to care for, but they do require specific water conditions to thrive. They prefer cooler temperatures (68°–75°F), high oxygen levels, and strong water flow to mimic their natural stream environment. Once the right setup is established, Hillstream Loaches are hardy, peaceful, and excellent long-term algae eaters for planted and community tanks. { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{ "@type": "Question", "name": "How many Hillstream Loach should I keep together?", "acceptedAnswer": { "@type": "Answer", "text": "It’s best to keep Hillstream Loaches in groups of at least 3 to 6 individuals. These social bottom-dwellers are more active and display natural behaviors when kept together. In groups, they form small territories, graze on algae, and interact peacefully. Keeping multiple hillstream loach fish also helps reduce stress and ensures they remain healthy and active in the aquarium." } },{ "@type": "Question", "name": "How long do Hillstream Loach live?", "acceptedAnswer": { "@type": "Answer", "text": "With proper care, a Hillstream Loach can live for 8–10 years in a well-maintained aquarium. Consistent water quality, a strong current, and cool, oxygen-rich conditions are essential for longevity. A balanced diet of algae wafers, sinking pellets, and blanched vegetables also helps extend the hillstream loach lifespan and keep their vibrant patterns bright." } },{ "@type": "Question", "name": "Are Hillstream Loach hard to keep?", "acceptedAnswer": { "@type": "Answer", "text": "Hillstream Loaches are moderately easy to care for, but they do require specific water conditions to thrive. They prefer cooler temperatures (68°–75°F), high oxygen levels, and strong water flow to mimic their natural stream environment. Once the right setup is established, hillstream loaches are hardy, peaceful, and excellent long-term algae eaters for planted and community tanks." } }] }
