I have two young cresties and both are on a mixture of soil and eco earth, but that is because we have zero humidity here and paper towels and misting just don't cut it.
You could still use the soil for humidity, and stick paper towels over it.
I do not feed bugs since I'm using a loose substrate.
I did the Tub DIY and it is pretty easy and a lot of fun
There may have been an insect like a spider or something in your tub, or you have a Crestie that likes to eat everything. My Bearded dragon ate his paper towels and fake plants, so now he is on shelf liner and nothing he can break off and try to eat.
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