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That is a common 'rule of thumb' out there, it's in many chicken books and websites. It can work, but often does not. Your case may take longer to 'cure'....but at ~10 weeks old the aggression 'habit' is probably not too instilled as of yet. Give them lots of space, some high protein(20-22%)...

Yes, bare minimum.....and are separate for coop and run, not combined The biggest run will not make up for a crowded coop.

Boy, it's really hard to say what to do. Aggression/bullying can be come an ingrained habit.... .....or it could just be stress from being in a new place. The separation may be prolonging them being able to set a pecking order. So you have 6 existing birds a year old that all get along just...