Good or Bad?

arf

New Member
Here is a photo of some kind of worm that was found living under live rock. It is fat on one side with a flat top and narrow on the other. It has been moving around a little but has not left the rock. It is about two inches long and light brown in color. There is no indication which side is the head. Can anyone give me an idea of what it is? Should I leave it alone? Thanks.
 
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