I have 3 adult hens in the coop now and two 12 week old australorps in a 4x3 brooder. I put a addition on the coop and will move the 2 australorps at some point into the addition. I will keep them seperated but seen by the adults for a break in period. Then remove the screen divider and let them mix. I found out the feed store has 2 australorps left over and are 12 weeks old. I wanted to get them. Should I put them in the brooder with the ones I have or just put all four in the divided addition. Whats the best way to integrate them? Do they fight at 12 weeks old ?