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Does that have legs and eyes? I can't really make it out. Take it out of the tank and put it in a dixie cup or something with some tank water and take pictures. It will show up better on the white back ground...
Just finished reading about them, now I know what has been happening to my snails and crabs, btw I just lost an emerald crab any way that Mantis was the culprit?
They are pretty cool, but if you're wanting anything else in the tank, you'll need to take him out. He will kill EVERYTHING you put in there with him. You could start another tank for him if you want to keep him, or take him back to the LFS and see if you can get store credit for him or if they'll just take him.