Four Spot Butterfly

Chaetodon quadrimaculatus. Quite nice looking, as it has a yellow mouth, white face with a dark yellowish eye band edged in black, and a body having a blackish upper half with two white patches, with the lower half bright yellow and having some small dark spots. There’s also a white vertical band just aft of the eyes, and the dorsal, anal, pelvic and tail fins are yellow, with the dorsal and anal fins containing a narrow bright blue band.