I have six chicks purchased in pairs one week part over three weeks. The last set I got were two Americanas 2 weeks ago. I put them in with my other chicks and everyone seemed to be fine. This morning after two weeks of living together I wake up to lots of chirping and find that one of my Americanas has a huge spot on her back. She is very docile. So I removed her but now she spends lots of time chirping in distress. Bauer I gave them outside time today they all seemed fine except towards the end my Barred Rock started trying to peck my injured Americanas eye. Not sure what to do. Should I let them free range together? Do I need a bigger brooder? I have a bigger container but plan on moving my two oldest birds this week or next to the coop since they are feathered out for the most part. How long should I have to keep them separated. I do have sticks and blocks in the brooder to help keep them occupied. Also had a red heat lamp on 24/7 until today. They seemed happy so I am not sure why this happened. Any advice is greatly appreciated. I can take pictures of the injury tomorrow. Maybe she's sick and had not been pecked on I don't know.