A melon butterflyfish (Chaetodon trifasciatus) on a reef off the coast of Dar es Salaam. Melon butterflyfish are found in the Indian Ocean from East Africa to Western Java. The monogamous adults usually swim in pairs and may be territorial and aggressive toward other fish. They feed exclusively on coral polyps, particularly of cauliflower coral (Pocillopora). Photo taken with a Sony DSC-RX100M II Camera in a Nauticam housing with a INON S-2000 Strobe and a hand-mounted SOLA 2100 Video Light.