The Blue Damsel is great for new hobbyists due to its hardiness and small size, while advanced aquarists praise the colour and activity this member of the Pomacentridae family brings to the aquarium. Female Blue Damsel are completely blue. Males, on the other hand, have an orange tail.
Interestingly, the Blue 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, the Blue Damsel will return to its electric blue colour in a matter of seconds.
The Blue Damsel is somewhat aggressive, so its housing should be large enough to easily accommodate multiple specimens. It is a good fish for beginners and makes an ideal companion fish. The Blue Damsel is also a great choice for reef aquariums with invertebrates. As the Blue Damsel matures, it may demonstrate pronounced territorial behavior towards future additions to the aquarium. If keeping the Blue Damsel with other damselfish, provide multiple hiding places to break up territories and decrease aggression.
This species is not overly aggressive like most Damselfish species, they will not harm invertebrates or coral and will graze on some algae species.
The diet of the Blue Damsel should consist of flaked and frozen foods, and herbivore preparations.