Ive read to feed my chicks starter until 8 weeks and then move them to grower until 6 to 7 months old. Purina doesnt have a grower, so do I just keep them on Start & Grow until 6 to 7 months old. Im assuming from the name Start and Grow is starter and grower? They are on Dumor now, but I will have to by another bag soon, and I dont think my Dumor is medicated. Can I go from non-medicated to medicated, or could that hurt the chicks? What do you feed you chicks?