Who said anything about it being wet? I keep my substrate "damp" and they have NO problem burrowing in it. When I used 100% sand for their substrate, they'd burrow all the time! And I NEVER have problems with "fungal or bacterial issues".
Here's just one of many photos I took:
Easy there.
If you did not want opinions from other keepers, why post in a public forum?
Watching FrogTV because it is better when someone else has to maintain the enclosure!