oddly enough the only thing i could find really just terribly wrong for an invert in a pet store was the hissing cockroach tank....the ground was litterally moving and of course solid white...I'm curious are the little white squirmy things mites or springtails or what? I had mites on my snake once and they were dark and i had to oil 'er down to get rid of them...but i have no idea what i saw in that tank. Any idea's?