Nix works great, and I like to combine it with PAM. I use PAM during the QT process as to prevent anything like this, but then I use nix back when I received a new addition that had mites from a reptile show. Regardless I always treat, as I'd rather be safe than sorry.

Also, if I remember correctly I want to say PAM states it lasts for 30 days, however if I'm treating, I retreat every two weeks for the first month. Then I'll stop the mite treatment and just do a normal QT after that. Also when I come home from a reptile show, especially if I held any snakes I take my clothes off, minus my boxers before I walk in the door, it goes straight to the washer along with my boxers then I jump in the shower. Just because you don't see mites doesn't mean you're not transporting mite eggs.