Amphiprion melanopus (Blackback Anemonefish)

From Fishes of Australia: 

A blackish anemonefish with a yellowish to reddish snout, belly, dorsal and caudal fins, black pelvic fins and a mostly black anal fin. Most individuals have a white bar with a narrow dark border on each side of the head that is often connected over the top. Small juveniles are red with one or two additional white bars at mid-body and base of the tail.