The Rainbow Shark (Epalzeorhynchos frenatum) is a striking freshwater fish known for its sleek, torpedo-shaped body and vibrant red or orange fins. Native to Southeast Asia, it is commonly found in rivers and floodplains, thriving in warm, well-oxygenated waters. Despite its name, it is not a true shark but gets its name from its shark-like body shape.

In aquariums, rainbow sharks grow to around 6 inches (15 cm) and require at least a 50-gallon tank with plenty of hiding spots, as they can be territorial and aggressive, especially toward similar-shaped fish. They are bottom-dwelling omnivores, feeding on algae, small invertebrates, and plant matter. While they can coexist with fast-moving, non-bottom-dwelling fish, they may harass slower or similar-looking species like red-tailed sharks or loaches.

To keep a rainbow shark happy, ensure a well-maintained tank with stable water conditions, a sandy substrate, and driftwood or caves for hiding. They thrive in water temperatures between 72-79°F (22-26°C) and require good filtration to maintain water quality. Given their semi-aggressive nature, careful selection of tankmates is essential.