i think you should let them peck each other just let them to their thing but if they get to rough then step in .. i had to big roosters they always fought with each other but i had to let them be i wanted to stop it but the newer younger rooster wanted to be the new alpha rooster so i had to let them fight but they didn't do damage to each other some times just a little blood on the back of the roosters comb my older/old alpha roo but their fine now a little fight here and there but its nature you gotta let them be