Evil creatures. I dealt with them in my old coop once. Thankfully, no issues in new coop. I use DL bedding in new coop, dust with permethrin and DE (only using DE b/c I have it, but may save the rest for the garden!) on coop floor, ends of perches, bottom of nest boxes when ever I change out bedding. I'm wondering if the DL bedding is home to predators of red mites. I also use aromatics in coop: Citronella, mint, marigold, lemon balm, creeping charlie.