I have jsut had a horrible run in with the fowl mites. the BAD MITES... so to speak. I have had grain mites (the cutelittle white mites) they are totally different from the fowl mites. You can tell the difference. If they are the fowl mites, get them treated NOW!!!! i just lost my best roo to them. The fowl mites can kill you birds and do it quickly. You will need to treat the entire coop and bird if it is. It is not a big dollar to do, just lots of work. I pulled my coop apart and sprayed with permitherin I got from TSC. I then dusted the birds with POultry spray from TSC (a permitherin dust). BURN the beding. I can hold mite eggs for weeks. 7 days later do the same thing again. It took my birds from top notch beautiful birds down to heck. please please please get on them if they are fowl mites.