Yeah you definitely need some between your snake and a heat mat.
Makes sense to why you need a drainage layer then.
Is this enclosure just a wooden box? I know someone people who will seal the wood so it's not as flammable and does better with the constant humidity. If the wood is sealed I wonder if you can just continue to use your RHP even make a PVC top if you're concerned about screwing it into wood or PVC bottom if the bottom is a concern endurance wise.
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