Here's a solution that you might want to try, because it worked for me. In the past, mites somehow got into my collection and were all over my snakes, in their hide caves and in the paper towel substrate. I wiped out those little bastards after using (only once) Hartz tick & flea powder for cats. The powder not only killed the adult mites, but it also killed the barely visible babies. I dusted everything. The terrarium floor, the substrate, the snakes themselves, and their hide caves. After dusting everything, I left it like that overnight. The next day, there were dead mites all over the white paper towel substrate. After confirming that you've killed them, make sure that you rinse everything off really well with warm water. Like I said, I only had to do that once and I have never since had a reinfestation. Also, make sure that if you have a water bowl or dish in the tank, that you remove it to dust separately.