i use aspen for my tank but i was wondering how much i should use?right now there is about 1/2 in to 1 inch throughout the whole thing... is this too little.. does it need more? and also i saw that my snake like to burrow and hide under the aspen. but the glass directly ontop of the UTH is really hot.. What can i do to prevent it from being burned on the glass. the temp on the aspen is just right but if he goes underneath it then what?