What lanswyfte said. It shouldn't feel warm to your touch since our hands are naturally in the 90s already. If it was warm, that would mean it was in the 100s..120s which is definitely a hazard.
Personally don't have experience with flexwatt but I'm sure there are tons of videos on YouTube that explain how to set it up correctly. Or just search the forum!
As for humidity, plastic tubs already hold humidity very well. Maybe get rid of the cypress mulch and replace it with paper towel and see how it does
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