Centropyge bispinosus. This hardy dwarf angelfish is quite beautiful as its body is almost completely a dark bluish-purplish, often with yellow, red or sometimes orange vertical stripes. Quite secretive in the wild and because of its natural shyness its highly recommended it be added to only well established aquariums containing lots of live rock that can provide it many caves and crevices to explore and/or hide in when feeling threatened.