isopod

I turned on my lights yesterday in my nano shrimp tank, and saw a few of these things hopping around on the glass. I have no idea what they are, and whether they are harmful or not. Anyone have any experience with these? I read they might be isopods or something but I really have no idea...

Hi all, OK, I know this isn't an aquatic animal...but at least its a crustacean! I posted this photo on my blog last night--a highly magnified picture of a common sow bug or woodlouse (order Isopoda).—along with a brief explanation of how I did it. More discussion will follow in the next...