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The Rainbow Shark (Epalzeorhynchos frenatum) is a strikingly beautiful and active freshwater fish, highly sought after for its vibrant coloration and distinctive shark-like appearance. Originating from the rivers of Thailand, this species typically boasts a sleek, dark black to grey body contrasted sharply by brilliant red or orange fins, including its caudal, dorsal, and anal fins. Growing to an average size of 4-6 inches (10-15 cm) in a well-maintained aquarium, they require a tank of at least 30-50 gallons for a single specimen, with larger tanks recommended to provide ample swimming space and territory. Rainbow Sharks are known for their semi-aggressive and highly territorial nature, especially towards other bottom-dwelling fish, particularly those with similar body shapes or colors. They thrive in aquariums with plenty of hiding spots such as caves, driftwood, rocks, and dense plant thickets, which help mitigate aggression and allow them to establish their own domains. Compatible tank mates include fast-moving, mid to upper-level swimmers that can hold their own, avoiding slow-moving or long-finned species. As omnivores, their diet should consist of a varied mix of high-quality flakes, pellets, frozen foods like bloodworms and brine shrimp, and vegetable matter. Providing an appropriate environment and carefully selected tank mates ensures that this captivating species can display its full splendor and fascinating behaviors.

Territorial, especially with other shark-shaped fish. Can be kept with robust, fast fish.