I don't know if I'm considered an "expert" or not, but it's quite possible to keep a high humidity without having wet substrate.
Personally I try to avoid using moist substrate as much as possible, as things like boluses go rancid pretty quick, and I don't use any isopods/cleanup crew (except the ones that find their way into my tanks through feeders or something).


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Is that a threat posture or are you just happy to see me? 
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