Tangs are one of the most sought after saltwater aquarium fish in the aquarium hobby. There are many different varieties of tangs and temperaments. They can be kept in a reef aquarium or fish only tank. Some tangs can become quite large and should be housed in larger aquariums. Some tangs can be aggressive to other tangs and should be placed in the aquarium in order of their temperament, being least aggressive first to the most aggressive last. .