Your 7 Chickens need a minimum of 10 sq ft per bird in their run (70 sq ft)and 4 sq ft in their coop (28 sq ft) or roughly 100 sq ft total If uncorrected they'll likely bully each other until one is killed and/or cannibalized. Once your flock develops this bad habit it'll teach others to do to...
Edit:
I ordered 10 dominiques a few years back and some ended up being barred rocks so I mistook them to be cockerels. The age and a photo of both barred chickens would help thanks! Cockerels have more white than barred hens.