Splendid Pseudochromis - Pseudochromis splendens

Manonichthys splendens (Syn. Pseudochromis splendens)

This pretty and brightly colored fish inhabits the Indian Ocean and the west pacific region. Due to its striking color pattern,it occasionally makes its way into the aquarium trade. This checkered fish grows to a size of 13cm long.

http://en.wikipedia.org/wiki/Splendid_pseudochromis