make sure you wash everything in dawn dish soap...hot water and a touch of bleach. Then re wash in just hot water. If you have live plants ....get rid of them. Be sure to get in the corners really really good. When the Pam arrives you will need to do this again...then spray and let completely dry. Follow the directions to the T. Be sure to follow up every couple of weeks with another application and do this for about 6 weeks. And again.....really really get up around the corners...this is where the eggs are. The trick for you is going to be feeding....once you treat the enclosure the feeder insects will die. You may have to feed him outside of his enclosure.
He is soaking as he is trying to get rid of the mites and is uncomfortable.