Hello everyone! As a mother's day gift, I received 7 hens and I couldn't have been happier. We just finished their new & improved coop with a run and they will be going in it tomorrow. We are so excited! But since I am new to this, I have just a couple questions. Out of my 7 girls, 5 are all the same age (around 9 weeks old) and 2 are 2 months old (almost 3 months old). Currenlty they are all eating medicated chick starter. My question is, what do I feed them after this and when do I make the switch? Also, do I provide scratch on the floor of the run? I have also heard of people using oyster shells and wanted to know what this was all about. Thanks in advance for helping out a newbie!!!!