I have 15 heavy breed hens of various breeds and 2 Australorp/Orpington roos. The roos get along very well as they were raised together. One is much larger than the other (hence the names Midas and Napoleon). The worst thing that ever happens is that Midas (the larger of the two) chases Napoleon around a little but they have never fought. Our new additions for the year are 4 more BR hens and 4 mixed breed bantams who are now 9 weeks old and getting along great. One of the bantams has turned out to be a roo. I have never had a problem introducing new chickens to their elder members of the flock but I am concerned about having the Bantam roo with the standard roos (who are about 10 times bigger). I was not too worried about the bantam hens as my standard roos seem to already have their favorites and the bantams hens can already fly/run away from things pretty easily. However, the roo changes all that, I guess. Am I better off just having a seperate bantam flock altogether? I don't want any of them to get hurt or to develop any difficult behavior problems as they are all very sweet and friendly birds. Thanks for the advice!