I use news paper as beding . You will have to get mite powder and add it to the enclosure. In about a week or two they will be gone . You need to get your feeders from a new place because that is where they are most likely coming from .
This predatory mite only feeds on the mites. After there are no more mites in the enclosure, they die. Safe and effective. Depending on how many enclosures you have, can get expensive. As you know the mites are likely in the snake room. If just one setup, easy to resolve.