The Harlequin Rasbora is a small freshwater fish native to the streams and rivers of Southeast Asia, particularly in Thailand and Malaysia. It typically grows to about 1.5 inches (4 cm) in length and is known for its striking coloration, featuring a vibrant orange body with a distinctive black triangular patch near the tail. This species is popular in the aquarium trade due to its peaceful nature and attractive appearance. Harlequin Rasboras thrive in schools, making them ideal for community tanks. They prefer well-planted environments with gentle water flow, mimicking their natural habitat in the wild.