NIX and PAM have exactly the same active agent. I know LLLreptile did a video on using reptile spray to kill the mites on the snake and at the same time using PAM to treat the enclosure. She recommended doing it weekly for two-three weeks to kill all of the mites in each stage of life. Sounds like you had treated the enclosures but not the mites on the snake so it could be possible that when you used the NIX (on the animal too I assume so correct me if I'm wrong, that's how I've seen it recommended) then you may have knocked out the last piece of the puzzle. ?