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Nice photos! Technically it is not a nudibranch, as specified in the text is a Sap-sucking Slug (Sacoglossa)
Thanks everyone. I have many shrimpgobies pictures of different species, i will have a look to the mission!
Thanks for your comments! O. gracilis is not present in waters around Sulawesi, apparently prefers colder waters... Can be maybe other species of the same genus...