This is my first time owning chickens, and I'm trying very hard to do my best! My 5 Rhode Island Red chicks are about three weeks old now and they're fighting a lot. At first I thought they were developing their pecking order, but now they're getting really big and do the chest bump thing all the time. The brooder I have is 3 feet long and 1 and a half feet wide. When they were smaller it was perfect, but now I'm not sure if they feel to crowded. All they want to do is fly and sit on top of the walls of the brooder when I take the screen off. I have plenty of roosts for them to sit on. They also never peck each other and they seem happy and VERY active. When they do fight they only spread their wings, circle each other, chest bump and make a really loud chirp. I'm pretty sure I have one roo because he's the smallest with the biggest waddle. Should I make a bigger brooder, or just let them be?