Oh, & btw, your cage temps are fine. For substrate I line the cage floor with one thickness of paper towel. I fold them up about 2" & do like reverse bed sheet
corners so as to contain the substrate of paper shreds & Carefresh mixed 50:50, about half inch deep on top of the paper towels. I don't seem to have a problem
with rat snakes burying under the substrate either, though a hatchling might if the hides aren't adequate. You can spot-clean this way, & also easily roll up the
whole substrate when the need arises to clean.(you could use all paper shreds too, if you like- Carefresh is hygroscopic & good for desert snakes especially,
but it's not essential...our houses are heated in winter & that removes a lot of humidity anyway, along with the UTH)