The Harlequin Rasbora originated in South East Asia in areas such as Malaysia, Singapore, Sumatra, Thailand. The Harlequin Rasbora generally inhabits streams and other watercourses with low mineral content and pH due to high concentrations of dissolved humic acids from flowing through peat swamp forests.
An ideal community species that is absolutely peaceful and must be considered one of the most peaceful aquarium fish. It actively shoals or schools and is a great addition to any aquarium. Displays best when kept in schools of six or more and kept in a well planted aquarium, with some floating plants on the surface and open swimming areas.