I have 3 silkie chicks 2-3 weeks old, a cochin frizzle 3 weeks old, and another cochin frizzle 4 weeks old. They're in the same brooder box with no problems, except now the 4 week old frizzle is flying at the younger chicks aggressively. Could the little one's be harassing her? Does she need more space than the others? What could be the problem? I don't want anyone to get hurt.