Tetra

Tetras are freshwater tropical fish that include both small South American fish belonging to the family Charcidae and African fish belonging to the family Alestiidae. There are numerous species that are referred to as tetras, including the very popular neon and cardinal tetras. Other popular types include rasbora tetras, black skirt tetras and head-and-tail light tetras. They are hardy and make good aquarium inhabitants if kept in schools.