Aquarium Care & Feeding Pygmy Angelfishes are small in size, beautifully colored, rarely aggressive toward other fishes, safe to keep with most invertebrates and corals, eat nearly all varieties of commercial marine fish foods, and adjust well to aquarium conditions. This makes them ideal aquarium fishes. Potter’s Angelfish (photo above, left) is among the more difficult species of Pygmy Angelfishes to maintain in captivity and is suggested for hobbyists with well-established reef aquariums.