Well I did some looking and I could not find a single mite...anywhere. There were none crawling around on the rat rack, none on any of the tanks or tubs. Nothing, and I looked really well. They used to congregate around the bottles of flea spray (not sure why, but they did) and all the ones on the bottle are dead. I'm going to vacuum the whole room and clean all the cages really well. Then sometime this week I'm going to get that bottle of Iver-on and treat the rat I have and treat the rat rack.
Hopefully soon I can get some new breeder rats! Thanks for all the help everyone!