HCA: Hermit Crab Association

alrighty, i'll just leave em be then thanks a bunch guys

thanks rebecca! is there a way to get rid of them/prevent them from popping up so much? i deep cleaned my tank about 2 months ago, boiling the substrate for about 45 minutes, and washing the decor in hot soapy water. they just now popped up again X(

http://i76.photobucket.com/albums/j23/hatchetjuggalette/Screenshot_2015-08-05-11-03-54_resized.png i've looked all over the web and can't figure out what kind of mite these are. they're not attached to my crabs, just wandering around the tank, and multiplying quickly. if they're not harmful, i gues...