Chromis dimidiata. Also known as Bicolor Damselfish, Chocolatedip Chromis, Chocolate Dip, Chocolatedip Damselfish, Half-and-half Chromis, Puller, Twotone Chromis, Twotone Damselfish, Twotone Puller.
Found singly close to the bottom or in large schools over reef tops and upper slopes of lagoons and coastal reefs. They feed on planktonic crustaceans. Damselfish are egg layers. First they clear a site ready for a nest, then engage in a mating dance with rapid swimming and fin movements, during this time the males will often turn a shade or two darker and may display white blotches. Spawning occurs at dawn.