about substrate, temperature, burrow and urine/poop absorb

[Sauzo]

Thank you so much! Oh I'll keep treating him. May I know that will you treat him when he's in shedding?
Oh and may I know if he removes the substrate aside and makes a nest, when he poop, will he poop directly on the cage ground?

Yes and most likely yes. My boas will poop on the cage floor but most of the time, they poop in a corner which doesnt get uncovered. When they make their little nests, usually the sides of the cage get piled higher than the rest of it and since the boas usually poop on the sides or corners, it works out ok.