Help mites

I have mites on my chickens and in shed, small redish brown, can see them, when sqished there full of blood.... are they red mites? Will be moving girls to small clean shed today so i can clean theres properly along with the ground. Have been cleaning them out every week, and scrubing shed with poultry shield once a month, i have some jays fluid would it be ok to scrub there shed with it, wondering if its stronger than poultry shield? Have also been using diatom in shed and bedding. Also what would be best to use on the girls themselves? should i kitten frontline them or get something else? any help or advise would be greatly welcome. The horrible little beasties are everywhere...
Glenda