Sphagum moss dries up very easily. Its very good if you can keep it moistened. I would Recommend checking the ventilation on your tank. They're may be far too much adding to the speed that the moss dries up. It usually comes incredibly dry, almost like sand so i recommend really moistening it before applying it to any enclosure.
Good luck.
Pythonian. IF you purchased spanish moss in a pet store, its probably why you're encountering mites. Alot of the pet store brand substrates house mites, as they come into contact with the reptile departments in stores. I buy all of my substrates from garden centers and run into no problems. I use organic soil mixed with cypress mulch for my snakes, they are all doing good. I moisten the substrate depending on the snake. More for tropical, less for drier species.
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