I listen to a podcast that suggests you put bluecote on multiple birds if one is having problems. They peck at each other for a while but then get bored with it because they all have it on. The one you're trying to heal up doesn't get targeted for having something different.My Dh does not care for her. When I told him she was going to be at the Ag meeting, his response was "Does that mean you get to egg her?"
I have had lots of chicks and never had a picking problem. I know I have been lucky but I have my first. One little welsummer has a spot where she is missing feathers. So I had to separate her out in her own tank. I tried bluekote and a red light but nothing kept them from picking on her. So now she is getting lots of people attention. I hold her while reading and she snuggles up and goes to sleep. She has been named Chiclet.