We bought ours all together. I had EE's, silkies, orpingtons and some white crested polish bantams all together. At about 8 months old one
of the orpingtons started pecking all the other chickens really badly. No matter what I tried I could not get her to stop and it took a while
to pin down which one was the culprit. Meanwhile the orpington went after one of the silkie hens and almost killed her. I ended up moving both
my silkie hens into their own little coop near our backdoor. The silkie hen she went after is, um, for lack of a better description mentally challenged. The other silkie hen is a
lot brighter and never had a problem. My silkie roo is still in the main coop. By the time I figured out who the bad orpington was, she conveniently died. We have not tried to put the silkie hens back in the main coop. I do not think the one with the issues would handle it well and we like having our little silkie hens right out the back door.