Slug or nudi?

[Sullyman]

I thought I saw something moving on the base of a coral colony, and upon further review, found this guy. Any idea as to what it is or where I can look? If it's not harmful, I'd like to put it back.
thanks

 

[greenbean36191]

It's Dolabrifera, a small sea hare. It won't get much bigger. Put it back in.

 

[Grins]

I'd love a small one like that.

 

[Sullyman]

Thanks, I did put it back in. They only have a year life span.