Those little tubs are great at holding humidity. You might need more air holes to increase the air flow and bring that humidity down a bit if it is too high. Thumbs up on the IR laser thermometer, they are the best at measuring surface temperatures. Make sure to measure the temp on the inside bottom of the tub, below the substrate. The snake can burrow down to reach the plastic and you don't want that to be too high.
I do have a probe thermometer and use it to measure ambient temps in the tub. If the room turns out to be too cold, and the ambients inside the tub are low, you can try putting a towel over the tub to insulate it. If that isn't enough, I actually have a second flex watt on the cool side to make sure it stays at 80 degrees. But that may be overkill in most situations.
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