From what I've read seven dust seems to be my best bet. I bought the powder and spray. My action plan is to dust my 4 chickens with the dust then spray my coop top to bottom with spray. I also heard making a paste of petroleum jelly with seven dust and rubbing it under their wings and around the vent works great. I'm also going to throw away the sand in their dust bin and use fresh sand and put some DE in it. I'm ofcourse throwing out their pine shavings in coop, And Im going todust new shavings when I re fluff their coop. Will the above steps work? My chickens are about 13 weeks old and they are my first chickens. Is there something I did wrong and that's why they got mites or are they kinda inevitable? And is frontline really ok to use? Thank you for any advice !!