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It is a species of sea slug, an aolid nudibranch, in the family Flabellinidae. It can grow to 3 cm and its color can variate from cream or pink to violet, rhinophores with darker tone in their tips.
This species is distributed in the Western Pacific Ocean and can be commonly found in the Philippines and Malaysia.
Actually I am not sure if the species is correct. It is a Flabellina for sure.