Acanthochromis polyacanthus
Encyclopedia
Acanthochromis polyacanthus, the spiny chromis damselfish, is a damselfish
Damselfish
Damselfish comprise the family Pomacentridae except those of the genera Amphiprion and Premnas. They can grow up to long. While most are marine, a few species inhabit the lower stretches of rivers in freshwater. Damselfish usually have bright colors. in tropical coral reefs, and many of those are...

 from the Western Pacific. It occasionally makes its way into the aquarium
Aquarium
An aquarium is a vivarium consisting of at least one transparent side in which water-dwelling plants or animals are kept. Fishkeepers use aquaria to keep fish, invertebrates, amphibians, marine mammals, turtles, and aquatic plants...

trade. It grows to a length of 14 centimetres (5.5 in).
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