I used to have one in a 29 gallon before he died of giant starry Blenny attack. This is a smaller Anthias which doesn't need a large room to swim or other of its kind. Feed at least twice a day and make sure no mean fish that will bite the Anthias (darn Blenny) This Anthias kinda hovers around in the open so less rocks is ideal. Very pretty and peaceful fish. I will definitely get another when I upgrade to 34 gallon Red Sea Reefer 170.