The adult Black Angelfish, Pomacanthus arcuatus, is also commonly called as the Gray Angelfish. It has a gray body with dusky blue polka-dots and the same dusky blue highlights on the caudal, dorsal, and anal fins. Like many other large Angelfish they will display a different color pattern from the juvenile stage to the adult stage. They should also be kept singly, and not housed with other Angelfish.