Heat for bioactive tank & misc.

[Scubadiver59]

Mine are just the opposite...they seem to drag more in unless I have the substrate really thin. My Kings are notoriously famous for burrowing and then pushing more substrate up and into their hides so I have to clear them out from time to time.

Originally Posted by craigafrechette

Honestly, your best bet would be to use a Radiant Heat Panel (RHP). They're a bit more pricey, but worth every penny.

Also, I noticed you mentioned the depth of substrate. It's important to measure the actual surface temp, not the substrate temp. Snakes can and will burrow, push substrate aside, etc...and lay on the actual surface floor of the enclosure.
Most of my snakes push all of their substrate out of their hides within days of me changing out and adding new substrate.