Please ID, Crab or ....?

[input80]

Hi,

The wife found this little guy in her tank, is it a (bad) crab or something else?


http://i1349.photobucket.com/albums/p742/input80/89d6804e-9d5b-4e2f-b514-611d85714604_zpsh1xt2b9y.jpg (http://s1349.photobucket.com/user/input80/media/89d6804e-9d5b-4e2f-b514-611d85714604_zpsh1xt2b9y.jpg.html)

[WarDog]

Weird. Looks like some kind of Mite.

[Misses.ReefWars]

Possibly a zoanthid eating spider. How big is it?

[input80]

Not that small Warren, maybe 1/4" across?
Gall crab maybe?