So I am really thinking about getting those cave hides that split into two sections, really like how they look and think he would like those ALOT more then a half log. My question is, it says on the box to NOT place the cave over a UTH. Well if you have one take on the warm side and one on the cool side, and you have a UTH, what do you do? And to anyone that has these, do you just put a little bit of bedding in the cave or leave it empty?