Constant hen pecking-need a roo?

[Mattemma]

I have been having issues with feather pulling. I have 7 hens in a metal shed. I have added treats and just a few days ago some BOSS. Also give mackrel.One of my hens has a lot of feathers gone on her head. I covered her with blukote. She was again pecked terribly on the head so I pulled her til lthe feathers grow in.

Someone suggested I get a roo to put the girls in line,because the hen pecking by everyone is like a never ending battle to be top hen. Is a roo an answer when the hens won't stop attacking each other?

 

[snowflake]

don't know for sure if a roo will help, how much room do they have? Do they get to go outside or free range at all? My hens look like that right now because I had to many roo's ... what kind of hens do you have? If you keep her separate for long she will have the same problem when you put her back cause she will still be low girl in the flock. Maybe it would be better to remove the one on the top to re-establish the pecking order?