Neon Damselfish (Pomacentrus coelestis)
Diver's Lodge House Reef, Lembeh.
Close up of a few of them.
A few facts in this nice site: http://j.whyville.net/smmk/reef/journalFishDetails?id=11
The neon damselfish, "Pomacentrus coelestis" is a species of damselfish in the family Pomacentridae. It is found in the Indo-Pacific. It can grow to a maximum size of 9 centimetres in length. It occasionally makes its way into the aquarium trade.
Similar species: Cichliformes
Uploaded Oct 20, 2018. Captured May 23, 2018 04:43 in Paudean, South Lembeh, Bitung City, North Sulawesi, Indonesia.