Hello, We have 4 chicks who are about 5 weeks old and then another 25 chicks who are 2 weeks old. When can we put them all together? I let them out together now with supervision and the bigger ones peck at the little ones. But, the little ones are growing to big for the brooder so I am anxious to take down the brooder wire and let them all be together in the coop. Please advise. Also, is a little pecking okay?