Thank you everyone for the nice welcome. Just an update to our barred rock chick situation. After watching the 1 very aggressive chick constantly attack the buff orpington chicks and the other barred rock chick for a day, we had had enough. We returned her to the feed and grain store and exchanged her for another. There was an instant change in the brooder when we brought the new one home. It has been over 24 hours now and all 4 are getting along fine.