We have four one year old rhode island red production hens. We are thinking about adding one cockrele and four pullets. These would be rhode island heritage birds. After reading the mites threads I am starting to wonder if and how we should do this. I am pretty sure our hens are mite free. I asked the supplier and she said she had an outbreak last year. I read this to mean she has an ongoing problem. Maybe I am just being paranoid. Thoughts?