Clownfish ( Amphiprion) Usually they are a very peaceful marine fish. Avoid mixing the various clown species though. If you have a mix of different clown species in your tank, they will fight. If you have a host anemone in the aquarium with them, they will defend it. It usually works out best if you have only one or a pair of clowns in your tank. All are males when they are born. As they mature and start to pair off the dominant one will change into a female. The female is usually larger than the male and will be the primary defender of their territory.They have been bred in captivity and it is usually better to buy a tank raised fish because they will adapt better in the home aquarium. More information on breeding clownfish. Fish Food : Omnivore - provide a varied diet with live food, frozen food and they will also accept flake food. Also known as Anemone Fish, Orange Anemone Fish, Nemo