Hi, My chicks are 5 weeks old today! Happy birthday to my babies!!! I have been feeding my vaccinated chicks organic chick starter, grit, and some treats too. They are Cochin bantams and are just going to be for fun to raise and care for. If they lay some eggs that's fine, and there are a mix of pullets and roos, so when should I change their feed from starter and what kind of feed should I give them? Thanks!