Weird creature in tank

[saltsac]

I'm hoping maybe someone can help me figure out what I just noticed in my tank this morning. The "thing" in question is round and about the size of a quarter. It is black with a white stripe down the middle like a skunk and I could make out 2 small antennae. It was moving very slowly across a piece of rock, sorry I don't have a picture, I can't figure out how to re-size them. Anyone that may know what this is and if I should get rid of it would be a great help.:help:

 

[promisetbg]

Bang will probably be best to ID,but in the meantime..you could look up Polyclad Flatworm..see if that's what it looks like.
We have a sea hare here locally that is black,flat and has 2 antennae..they are algae eaters.It occasionally seperates it's back skin,especially when touched or bothered,which would explain why it looked as though there was a stripe down the middle.Both are possiblities.If it is the sea hare,they eat algae.

 

[saltsac]

Thanks for the help, and after doing a search it sounds like it might be a black fleshy limpet?

 

[tennisace]

Could it possibly be a nudibranc (sp.)? <<<somewhat like a slug
Whatever it is it probably isn't harmful

 

[bang guy]

Originally posted by saltsac
like it might be a black fleshy limpet?
Yep. AKA Elephant Slug.

 

[saltsac]

thanks for the help everyone