The mention of vent holes reminded me of a little trick you can use (this would be especially recommended if you have other snakes that can become infested). You can put some petroluem jelly AROUND the holes on the outside of the tank to keep the mites from exiting. When they try, they'll get stuck in the stuff and die. With only one snake I've never tried this personally, I sprayed around the tank with the Nix to catch escapees. It's harmless to carpeting, etc. They really are evil little things :P You'll probably also want to dispose any trash from the tank, out of the house.