Description

The Rainbow Shark, native to the river basins of Southeast Asia (Mekong, Xe Bangfai, Chao Phraya, and Maeklong rivers), prefers calmer waters with sandy bottoms and lush vegetation. Despite its shark-like appearance, it is a ray-finned fish, not a true shark. The species is widely available in the aquarium hobby and is often sold under various names, including ruby shark, red-fin shark, and red-finned shark.

Rainbow Sharks are moderately difficult to care for due to their territorial behavior, especially towards others of their species or similar-shaped fish. They require larger aquariums (55 gallons or more) with plenty of plants, caves, and tunnels to reduce aggression. A 125-gallon tank is ideal for housing multiple Rainbow Sharks or keeping them with species like Red Tail or Bala Sharks. They prefer sandy substrates but can also adapt to gravel. Providing ample vegetation and hiding spots is essential.

While they can be kept with most community fish, Rainbow Sharks may be aggressive towards shy species. In tanks under 30 gallons, their territorial behavior may increase. In the wild, they feed on algae, decaying plant matter, insect larvae, and small meaty items. In the aquarium, they accept flake, frozen foods, tubifex worms, bloodworms, and algae wafers, with a vegetable-based diet to support their health and immune system.