Flatworm? Or some sort of slug?

[Whatskillz]

Any idea what this is

 

[dball711]

Looks like a Sea slug/droid nudibranch. Vayssierea Sp.

 

[Whatskillz]

Yeah it does.



It was more clear around the edge and red insided.
Probably harmless tho?
Or some sea slugs eat coral?