Hello, yes, I do have luck keeping 2 roos in a flock of 10 hens. When I introduced a young cockerel, Ledo, into Benny's flock (Benny was 1-2 yrs old at the time, and Ledo was a few months old. Note that Ledo was NOT raised with Benny). Benny and him started fighting, but when Ledo had a growthspurt and was much bigger than Benny, he used that as an advantage and ultimately defeated Benny (which might happen to your chicks, they might grow bigger and stronger than the dominant roo and will want to be dominant over him.) It took many gruesome fights for them to finally agree that Ledo was dominant over Benny and that he ruled the flock. Ledo took out a chunk of Benny's comb once. I've heard on here that when roos fight, they might take an eye out or even worse, so Ledo's and Benny's fights were nothing compared to other roo's fights. Ledo will remind Benny every day that the girls are Ledo's girls, and not Benny's, and therefore he cannot come around the hens. Sorry for the long post. Hope this helps.