Here is some info on mites from the biodude, scroll down to it :. I doubt you'll have any trouble in the beardie tank though. Web the crestie tank may have a more difficult time if they get to a large number because of the humidity.
Bioactive terrarium for leopard gecko
Bioactive terrarium checklist
Bioactive vivarium no drainage layer
Predatory mites? advice? Bioactive terrarium/vivarium. r/terrariums
