bangaii's are interesting fish . they are born male or female and can't change sex like clowns. they have a single, or set of fins that can be used as a positve male/female ID . they warrant some research ,if your interested getting a pair. viral issues in wild caught fish are common. the breeding cycle is tough on males. a single fish isn't a bad idea in many cases IMO. usually a very hearty,peaceful fish once established. very few tankmates seem to bother them. i killed many in my attempt make a pair. my advice is to buy an established fish or pair ,that were tank raised(not aquacultured).or better yet, buy somebody's who are bigger than a quarter. mine will only eat meaty frozen food.