My chickens seem thin, I'm doing treatment right now for deworming ( wasine) I don't think that cocci is a concern really because the chicks seem thin too ( they are in adjoining pens ) and they are one medicated feed. The chicks get medicated feed with a little bits of flax and BOSS. The adults get 2/3 layer crumbles with 1/3 scratch mix & flax BOSS. I mix probiotics with all of the feed. The adult bunch gets healthy scraps ( which equals about a quarter sized chunk each or less per day ) and various greens at least once or twice a week. They all have fresh water and clean pens, I clean pens at least once a week more if needed. The adults have a very large pen, I'm going to guess it's 20' x 40' or so plus a coop. The chicks in question have a 3'x 3' inside area with an outside run about 4' x 6'. Any suggestions?!