Re: moss in enclosure?
Moss needs light to grow. So, it's not going to work in a hide box. All of the types I've tried to use in my indigo's enclosure also apparently need more moisture than what I provide. It always dies. But, the dart frog people seem to do pretty well with it, but they have very wet enclosures. Perhaps there are moss species that would do ok in normal snake enclosures, but I haven't found them yet.
If you're having a very difficult time keeping humidity up, you probably have too much ventilation.
“...the old ones ... knew in their bones... that death exists, that all life kills to eat, that all lives end, that energy goes on. They knew that humans are participants, not spectators.” -- Stephen Bodio, On the Edge of the Wild