Snail looking thing, ID PLEASE

lacybiker2000

New member
Hi, got this guy as a hitchhiker on a frag plug. Don't want to put him in the tank if he's bad. Looks like a snail without the shell although he does have a 'toenail' looking thing on his back. He is black, but the inside of the 'foot' underneath is white. Is this a snail without the shell or some type of slug. Is he good or bad? Thanks
 

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