I have two 4 week old red stars and we just got 2 ameraucanas who are the same age. One of the reds has been attacking the newbies and they've just been cowering in the corners of the brooder. I've removed the red who keeps attacking and when I do, the newbies are SO much happier. I know this is just chicken business and it's hard to watch it go down but I don't know if I should keep the troublemaker in a separate brooder for a while or if I should just put them together and make them all just get over it. lol Help!