Compatibility: For the most part Angelfishes can be real bullies. Being very territorial and aggressive, these fish will particularly fight with species of their own kind and sex, as well as with other related and non-related fishes that are similar in appearance, color, shape, or behavior.The smaller Centropyge genus, medium size Chaetodontoplus, Genicanthus and a few other genera species in this group do well in a non-aggressive fish community with other non-related species like Anthias', Butterflies, Gobies, Blennies, Tiles and such.
Other larger Holacanthus and Pomacanthus genera species commune well with less-passive tank mates, such as Triggers, Hawks, Groupers, Damsels, and Surgeonfishes.Most Angelfishes live a solitary life, but some wander the reef in small groups of two or three, which are usually mated pairs or trio's of one male and several females. It is not uncommon for multiple males and sometimes females placed in the same aquarium to fight to the death. Overall Angelfishes do best when kept singly, one to an aquarium, but there are some species that make good pairs or can be kept in multiple groupings under the right conditions.Good Communal Species: The Lemonpeel Angelfish (Centropyge flavissimus) makes a good pair, and a trio of one male and two females can be kept in no less than a 100 gallon aquarium.
The Cherub Angelfish (Centropyge argi) is good for pairing and two or more females can be kept together, but only as long as the tank is at least 50 gallons ...