Saltwater Anthias Fish for Sale - Anthias are a colorful active fish and a good addition to the home aquarium. They can be kept in a group of females and one male. The males will fight if there is more than one male in an aquarium. If all females are purchased, it is not unheard of that one female will change and become a male. They do best if fed more than once a day. They are reef safe and are not aggressive to other aquarium inhabitants.