Go to walmart. Find the lightbulb and paint area. Nearby there will probably be a small section with indoor/outdoor thermometers. Buy one that's about $12-15 called the Accu-Rite Indoor/Outdoor Weather Station. Put the unit on the cool side of your tank, the probe under the substrate directly against the glass on the hot side. See what the humidity reading is.
Those dial gauges are crap.
I don't think there are any side effects of high humidity. I've been told by one person that it can cause a RI.
Using the paper towels, you're making what's called a humid hide. Some people just don't trust anything that wet in their enclosure because actual moisture and wetness can cause scale rot. If he can shed without it, don't use it.
What makes you think she loves it? Same with the climbing shelves. How much do you see her using them? She should be hiding during the day and most of the time in general. If she's not, something's wrong.
I would also get some cheap plastic bowls at walmart, cut entrances, melt the edges with a lighter, and use those for hides. Those boxes are porous and will hold bacteria, etc. They don't look very secure, either.
Also, please tell me you have a thermostat on your UTH.









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