X2^^^^^^
also your Probe needs to be on the glass above the UTH so you know what the HOT SPOT Basking temp is (ideal 88-91).
I cant tell from a pic but your snake looks to long for those hides..
all those temps you mentioned are low but im wondering if your measuring them wrong. Those UTH get 140 without being run on a dimmer or JumpStart thermistat. You have to regulate heat sources, snakes die like that.
Keep substrate thin where Hot Spot is.
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