Often shy when first introduced to the tank, but they will quickly become bold members of the aquarium community. Juveniles can be aggressive towards their tank mates; especially fish that are introduced after the angelfish has become well established in their new home. Smaller individuals will clean crustacean parasites off of their tank mates. The tank should contain large amounts of live rock for hiding and grazing. Gray Angels are prone to nip at stony and soft corals (sessile invertebrates) and clam mantles.