The Blue Line Damsel is a very colourful, hardy, and active fish. In the wild, Blue Line Damsel are found throughout reefs, usually busy defending a small territory. The Blue Line Damsel has the ability to hide in a hole or crevice and darken to an almost black colour. This usually happens when it is threatened. After the perceived threat is gone, it will turn electric blue in a matter of seconds.
The Blue Line Damsel is somewhat aggressive, so its housing should be able to easily accommodate multiple specimens. It is a good fish for beginners, and makes an ideal companion fish for a saltwater aquarium, and as a great companion for reefs and invertebrates. As the fish matures it may become aggressive, causing problems with the selection of other species to be added to the aquarium. If keeping with other damselfish, provide multiple hiding places to break up territories and decrease aggression.
The Blue Line Damsel diet should consist of flaked and frozen foods, and herbivore preparations.