If your'e not treating the bedding before putting it in, chances are, thats where the mites are coming from.

Try this: treat the cage, hide, etc again like you normally do. Don't use the aspen, use paper towels. In fact, put the aspen as far away from the enclosure as you can. I kept mine in the garage. Try it for a month and see if they come back.

I used aspen and immediately had mites. Stopped using aspen, no mites.(I wasn't treating it).

Also, clean around the enclosure as well....wipe down any surface it sits on, PAM around the cage.

hth, good luck,

Keon