Bought a kit with an Exo Terra heat Wave UTH. My first tank has a UTH stuck to it, and I don't want to do that again. I've read the forums about attaching a piece of stone or ceramic tile to the adhesive then propping the heated tile against the tank bottom leaving an air gap underneath for heat dissipation. The only tile I can find is 1/4 in thick. How well would this transfer heat through the tile, then glass bottom, then 1-2 in of repti-bark or aspen? I would hate to attach the tile then find out my heat transfer is too low. Would applying fine sand or some other powdery rock to the adhesive work as well or is it preferable to have it stuck to large flat smooth surface? Would it be OK to just leave the paper on the adhesive and prop it up? It will be attached to a 20gal long btw.

