Flat worms? Are they any good?

toku58

New member
I have a few Flat worms/slugs that hitch hiked into my tank. Should I be concerned? Should I remove them?
 
Does it slide around the bottom of the tank and stick to things cause if it does I think it might be a sea slug of some sort
 
I actually found out that it's a Nudibranchia Dendrodoris nigra.

Should I remove it? I actually have several of them in my tank. Anyone know if it will cause any issues?
 
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