Right now you can spray Provent a Mite (PaM) outside your tree python cages. That will kill any mites trying to get in.

Same with the ball python cage - that will kill mites trying to get out.

Inside the cage, I like plain old flea powder, like Hartz, because it seems to kill mites but has never had an adverse effect. Some baby montane kings and rosyboas can have a reaction to PaM.
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Mark