
Titan triggerfish (Balistoides_viridescens)
Apo Island, Oct 2, 2012.
Up to 75 cm, titan triggerfishes have a dark body with yellow-green to blue crosshatches; a yellow and green snout and cheek, a whitish rear body and tail base.Also a dark moustache-like band above mouth. They are solitary and if is a female nesting, better be careful: they can attack and inflict serious bites!
Habitat:
Red Sea and E. Africa to French Polynesia. Lagoons and outer reefs (3-50 m.).
Notes:
This one I saw in Apo Island coral reef. It seemed to be hanging at a cleaner station.

The titan triggerfish, giant triggerfish or moustache triggerfish is a large species of triggerfish found in lagoons and at reefs to depths of 50 m in most of the Indo-Pacific, though it is absent from Hawaii. With a length of up to 75 centimetres, it is the largest species of triggerfish in its range.