The Red-tail Rasbora is abundant throughout the Chao Phraya, Mae Klong, and Mekong River Basins. Here it inhabits the still or slow-flowing waters of thickly-vegetated canals, ditches, drains, shallow ponds, swamps, and flooded areas such as rice paddies. This fish is a peaceful midwater shoaling species that should be maintained in groups of 6 or more.