Phyllidia varicosa

Scientific name: Phyllidia varicosa

These seem to be quite common throughout Southeast Asia and the Indian ocean. The 'base' color varies from stark white to sky blue.

Please note: Identification of fish, corals, etc. is a tricky business. It's entirely possible that I've incorrectly identified a photo I've taken. If you spot an error, please contact me so I can correct it and improve this resource.