So Clyde had been in his new enclosure for a week and he hasn't come up unless I dig him up. I notice that as low as he is digging that the heat isn't penetrating all the way down. I am thinking maybe that is why? I am thinking of putting rocks under the substrate so he can't dig down so deep but I am worried the enclosure stand can't hold that much extra weight. Any other suggestions of something I can put in the substrate to stop him digging as deep that wouldn't hurt him to dig at?