I have 7 chickens (mixed breeds) that are just over a year old and am trying to add 2 more. I started by keeping the new two in a separate pen but close so they could all see each other. Now about 12 weeks old, I have put everyone together and there are a few of the older chickens that do not like the newbies at all. It's been 5 days since they have all been in one run, the older chickens are chasing and pecking the new ones. To avoid being pecked the new chicks stay on the roost or hide in a nesting box. Will this get better? How long should it take for the older chicks to accept the new chicks?