First weeks of being a leopard gecko owner havent been so great. The store told me to absolutely go for calcium sand, which turned out to be a huge mistake. So i had the idea to cut out a huge tile to use as substrait. its a little under 1cm thick so I think heating it with a heat mat wouldnt be a problem. But if I would put a heat mat under half of the tile, wouldnt the whole tile get warm? And if so, is that okay? Because ofcourse they need a hot and cold side, so maybe by doing this there wouldnt be a cold side anymore. I'm really lost at the moment about what to do, because obviously I want the best for my leopard gecko, but its quite hard.