This species is the most aggressive, often found in pair. They make nest by making a large a big hole of sand or rubble and they lay the eggs in the centre of the nest and usually the female will guard the eggs. It can attacked furiously is divers approaching and cost serious wound. Dark base color, yellow mix with green color to blue. The cheek also have mix color of yellow and green, white rear body and tail base. At the upper have dark color like moustache. The body can be up to 75 cm.