legs

Anyone know what this hitchhiker is? It came in on a frag from a recent live sale. It looks like a small aquatic version of a roly poly. It has a bunch of legs (10 at least?) and two very small distinguishable eyes.

Has anyone tried mounting the orphek atlantik v4 compact using the aqua illumination light mounting system. I want to order the orphek while it is onsale but hanging it or mounting with arms from the back glass of the aquarium are out. That is why this particular option looks appealing. If...