I'm confused... Is your UTH sitting in the tank, most of the ones I see have an adhesive backing and can easily be stuck under the glass on the outside bottom of the tank. Then you wont have to worry about it getting wet. Also, I don't know how well moss keeps moisture, but I use paper towels in my hide, and I have to mist it nightly. Its on the warm side of my tank over the UTH. If your just using a hide, just place the moss down under it and I use a spray bottle and mist it nightly. Good luck hope this helps.
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This is courage.. to bear unflinching what heaven sends. -unknown

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