nudibranch ID - Help Please - Hitchhiker

[gts1218]

I found this little guy sneaking around and do not know where he came from. I like his colors but want to know if i can keep him or should i get rid of him. Thanks

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[AdrianBryce]

Not sure what kind of nudi it is. Have you added any new corals/sponges/gorgonians/live rock recently?

 

[greenbean36191]

It's Hypselodoris emma. It's harmless, but because it only feeds on a specific sponge, there's no way to feed it in captivity. It will starve to death pretty soon, so enjoy it while it lasts.