Wow, I didn't see that until you mentioned it. Definitely move it up higher and "I" would center it between the hot and cold for a more accurate ambient reading. I'll search the forum for a great picture of a good setup. It was drawn by a member here.
The substrate is fine. I go with around 1 inch deep. I do suggest that you move the hide to where one side of it is touching the enclosure to kinda block it off. That's not a very good hide for a bp as it dosent provide much security because it's wide open on both sides. I don't think you should have waited to get one and the fact that you are asking these questions tells me you care enough to do it right. Unfortunately I have seen setups far worse than yours so as far as I'm concerned, you're doing fine![]()