All 3 were born in April. 1 rooster was being overly aggressive to the hen, pecking her head and aggressivly mating. In the past month it seems they have established their pecking order and the docile rooster has paired with the hen. The lone rooster still aggressively mates if he gets the chance. I’m planning to add 3 silkie hens that have been raised together and are now 2yrs old. Is this the right thing to do? That will make 4 hens and 2 Roos. How long do I quarantine the new birds until I add them?