Centropyge tibicen

Centropyge tibicen, commonly known as the Keyhole angelfish, is the largest dwarf angelfish. They’re very dark blue till almost black like C. nox, but have a white vertical patch on their body and a yellow edge on their pelvic fins and the anal fin, and when mature they develop an electric blue rim around the unpaired fins.

Like all other angelfish it's hermphroditic and the most dominant fish will turn into a male when there is no other male around. These fish are quite peaceful but be careful combining them with fish a lot smaller or larger and other (dwarf)angelfishes. Although dwarf angels are certainly more likely to be reef safe compared to their larger relatives and thus seen more often in reef tank, they're always a risk. A very though fish, but most C. tibicen unfortunately are quite aggressive and/or do quite some damage to corals. Keeping them well fed seems to reduce the risk, so make sure to feed them a proper varied diet of algae and meaty foods to make them really happy, or keep them in a fish-only tank with robust tank mates!