Hanauma Bay, Oahu, 3 feet

Hanauma Bay, Oahu, 20 feet

Juvenile, Hanauma Bay, Oahu, 20 feet

Hanauma Bay, Oahu, 15 feet

A solitary species common on shallow reefs where it feeds upon algae.  Base color changes at will from light brown to almost black, with or without a light band at the base of the tail, neon blue fin margins and wavy blue lines on the body, and a pair of black spots at the base of the dorsal and anal fin.  Attains 10 inches.  Hawai‘i and the Tropical Pacific.