I have four two week old chicks. One silkie, one Barnavelder and two Easter eggers. One Barnavelder died yesterday and I'm waiting a week to see if anyone else is getting sick. After that I would like to add either another silkie and a barred rock or two barred rocks. I found a feed store that has the same age range available that I have. So the chicks could be same age...can I just put them together? That raises another question. My flock came from a breeder that has all natural food and the new once are from a feed store that gives medicated feed. What would I feed them?