I found mites on one of my hens. Her fluffy tush feathers are gone and the skin is irritated. I could not find any signs of mites on her during the day but I knew that something was going on. Tonight I went out after dark and checked her over again (she is not a happy camper) and I did find a few mites. Where there are a few mites there are probably millions. I've researched the site to find as much information as possible and instead of a dip or Sevin dust I want to try Eprinex. I have Ivermectin but it seems that Eprinex is recommended for external pests and Ivermectin for internal. Can anyone give me the dosage per bird please. When do I repeat the application? I'm pretty sure the mites haven't taken over the coop because every time I clean it out I sprinkle Sevin on the floor and all cracks, roosts and nesting boxes. I'll know tomorrow when I do an unscheduled coop clean out. Any input would be appreciated.