Nudibranch - Goniobranchus sp.
This one doesn't looks similar to Goniobranchus reticulatus which is a species more common in Philippines and South East Asia, it could be just a variation but am not certain. It has some similarity to Goniobranchus tinctorius but Goniobranchus tinctorius is supposedly not reported from tropical Indo-Pacific, but Red Sea and Oman.
Mentioned in Wikipedia for Goniobranchus tinctorius :
This species was described from the Red Sea. It also occurs in Oman. It has been reported widely in the tropical Indo-West Pacific but many of the records refer to Goniobranchus reticulatus, Goniobranchus alderi and similarly coloured, undescribed, species. Several of these have been shown to be distinct species by a DNA study.
No species identified
The species on this photo is not identified yet. When signed in, you can identify species on photos that you uploaded. If you have earned the social image editing capability, you can also identify species on photos uploaded by others.