Hello and thank you ahead of time for your help. I have 11 Red Star Sex Links who are about 8 months old and have started feather picking. All of them (except for one) have feathers missing on their behinds, some on legs, some tail feathers. I have seen ones that have feathers missing picking others feathers. This is what I've done so far: Avia Charge 2000 in water daily for past week; changed from pellets to mash (16% lay ration); provided extra protein daily from tuna or black sunflower seeds or hard boiled eggs or beef scraps. I've increased their greens in their pens as well. They free range in the backyard daily for 1-2 hours (this is their norm). Their coop and pen are open all day for them to roam. I've applied Blue Kote to their backs and legs. I've isolated one girl in a 30 x 30 rabbit cage in the coop. She has two areas they were open, but now scabbed. I let her out to free range with the others. Two others have exposed skin but no open areas. I just don't know what to do anymore. I've read about giving them styrofoam, but only want to do that as my very very last option. Can anyone help me to stop my girls from destroying one another? They are consistent mighty egg layers. I just love them. Thank you!