The Sumo Loach (Schistura balteata) is a small, semi-aggressive freshwater loach known for its bold black bands, torpedo-shaped body, and territorial nature. Originating from the fast-flowing rivers and streams of Southeast Asia, including Myanmar, Thailand, and India, this loach is an excellent choice for aquarists seeking an active and entertaining bottom-dwelling fish.
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A Name That Matches Its Sturdy Build
The "Sumo" name comes from its thick, muscular body and dominant personality, often seen pushing other fish away from its favorite resting spots, similar to a sumo wrestler in a match. Despite their small size, they are incredibly strong and territorial, especially towards their own kind.
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Growth and Tank Requirements
Sumo Loaches grow to around 3 inches in length, requiring a minimum tank size of 20 gallons, though a 30+ gallon tank is preferred for multiple individuals. Since they naturally inhabit fast-moving streams with rocky substrates, their tank should have smooth river stones, caves, driftwood, and fine sand or gravel to mimic their environment. Strong water movement and excellent filtration are essential to maintain oxygen-rich conditions.
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Care and Water Parameters
These loaches thrive in temperatures between 72-80°F, with a pH range of 6.5-7.5 and moderate water hardness. They require highly oxygenated water and strong currents, making a powerful filter or powerhead an important addition to their tank. Weekly water changes help maintain optimal water quality.
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Diet and Feeding
Sumo Loaches are omnivorous, feeding on small invertebrates, algae, and detritus in the wild. In captivity, they should be offered a varied diet that includes high-quality sinking pellets, algae wafers, bloodworms, brine shrimp, and vegetable-based foods like blanched zucchini or spirulina flakes.
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Unique Behaviors
Unlike most loaches, Sumo Loaches are territorial and can be aggressive, especially toward their own species. They do best either as a single specimen or in groups of 5+ individuals to reduce aggression. They are highly active, often perching on rocks, digging in the substrate, and defending their territory from tank mates.
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Please note that these are general guidelines, and for more accurate values, we encourage you to contact Living Aquarium by phone or in person. Within store hours, our team of experts are always happy to answer any questions you may have and provide personalized guidance on care.