Can someone please help me???

[Physician&Snakes]

I have had it for two weeks, I was using a CHE but switched to the UTH around Tuesday. He sat in the hide over the UTH for a few days and didn't move. He hadn't had a shed since I have had him, still hasn't eaten neither.
Also, where causes scale rot?

Scale rot is caused by excess moisture that is absorbed by vesicles within ventral scales and promotes a breeding ground for pathogens. In short, it is caused by a substrate that refuses to dry completely.