The day before Thanksgiving, I got 6 chicks in the mail. These kids were brooding together before they got here - they are not fully feathered, yet....They seemed to be getting along just fine, until the last day or so. I'm not sure, but I think the aggressor might be a cockerel. The victim is a pullet. She's the biggest in the group, and the best feathered. The one actively seeks out the other and just goes after her, relentlessly.... She has discovered she can fly up and get some distance between them. So, I separated the aggressor, put him in a cat crate, sitting next to the brooder where the other 5 are living. They can still see each other....The heat lamp can reach over there and I also put a pocket hand warmer in the crate for him... along with food and water. Is this normal, for chicks this young to have problems? I usually have a broody to raise chicks, so I'm a little new at this. There wasn't any blood, but obviously the pullet wanted away from the other chick. It was pulling her feathers and jumping up to spur her.... Is there anything I can do to alleviate the problem?