Raise the cage off the floor slightly, you could slip 2x4's every couple feet underneath the cage. You might be suprised at how cold the floor of the cage is at night, air is a great insulator.
The cage seems tall to me, you may want to build a dam at the front of the cage so that you can use 1-2' of substrate that will allow the animals to burrow and control humidity.
Bath time can be stressful to monitors and is usually unnecessary. Stress kills.

Good Luck

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