My corns and kingsnakes are housed in separatel 20 gal tanks with UTH affixed to the outside bottom glass. When cleaning the tanks with chlorine soln and rinsing the attached (stuck) UTH are cumbersome. I believe I've noted in a post that some stick the UTH to a separate tile or glass plate instead of the bottom of the glass tank. I would think this has the advantage of easy removal when cleaning or transferring of the UTH to another tank. My questions??? Is the tile with UTH place directly on it in directly in contact with the tank glass bottom? In orther words, does the tank sit directly on the tile with affixed UTH on the tile top? Does the UTH affixed this way work O.K.? Any drawbacks with this arrangement? I would use a rheostat to control heat and a probe thermometer to monitor heat. Thanks for you help with this. Don