Really worried about Twist

I am curious as to where the thermometer probes are?

https://ball-pythons.net/gallery/fil...1/hide_202.jpg

That's his hot hide.
He's got 3 hides total. I can ditch the one in the center if need be.

Kaorte, the temp. Probes are right on the bottom surface of the tub. There's maybe 1/4th an inch of substrate over the probe. There's one probe on the surface of the rock.