Thank you for all your advice, I will remember this for the future but after close inspection and reviewing a ton of pics off of the internet I have determined that I was miss informed by the prior owners and they are all Hens, very aggressive hens. Today they attacked a Wyandott so bad she was bleeding everywhere. 4 out of 5 of them were the attackers, they had blood all over their beaks. They are currently separated now, with the attacked hen hiding. After reviewing the coup size the run is 8 by 6ft for the chickens making it 48 sq feet. The roosting and nesting areas are upstairs and are not included in this figure. I plan on adding onto the run this weekend in hopes that this will fix the issues.
Other than crowding what could cause this twoards one chicken. I know protein in the diet is good, however I did notice one of the hens is not getting enough calcium, I was washing an egg and the shell crumbled. The other hens had hard shells.
