Some of the many damsel fish are reckoned to be the hardiest of all reef fish, and as such they make ideal beginners fish. Some beautiful juveniles mature into dull and aggressive fish, so choose carefully. There are largely peaceful, attractive, and modest-sized species available.
On the coral reef the Green Chromis (chromis viridis) occur in huge aggregations, usually close-by some hard corals into which they can dive away from danger. In the aquarium they soon settle to the fact that predation has been eliminated from their environment, and behave less frenetically!
The Blue Devil (chrysiptera cyanea) is one of the most brightly coloured of the several similar species of damsel fish. It needs to be introduced to the marine aquarium with care, as not all specimens are of a quiet temperament.