Fish ID: Spiny Chromis

Damselfish spiny chromis acanthochromis polyacanthus hon
Family Damselfish (POMACENTRIDAE)
species Acanthochromis polyacanthus
size To 12cm
locality Lagoons and coastal reefs
behaviour Solitary or in pairs
range Asian Pacific

Highly variable, usually dark body and white tail and dorsal fin; not sure whether the white lips and yellow ventral fins are consistent or indicative.