Hello! I'm new to chickens, and I just purchased 3 hens and one rooster (13 months old). They are currently in a coop, but once settled I will allow them to free range during the day. I'm currently feeding them organic laying feed. What other supplements do they need to stay healthy and pest/worm free? I would like to be as organic and natural as possible. I'm very excited about eating fresh eggs and the natural bug control. Now if I could just get them to eat the gophers... Thank you!