What I always like to think is -
1000, even 100 years ago, people didn't have specially made feed like starter, grower, layer, broiler, medicated, etc. ALL chickens would have gotten the same thing, some kind of a mixture of grain and corn (what we feed as scratch nowadays). So I wouldn't worry about the chicks eating the organic layer feed, but I would be concerned with the hens eating medicated feed. I wouldn't want to know what got into those eggs!
Try switching the chicks onto non-medicated. As long as they're in the coop, in dry, clean bedding, it is unlikely one would develop Coccidiosis.
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Actually, a while back I was in the feed store and I saw a chick feed with Tetracycline, the well known antibiotic and medicine we know mainly as a potent antibacterial and acne cleanser. This was their main line of chick feed, and when I first started with my chicks (now getting ready to lay eggs!) I made sure my feed just had amprolium, which is non-antibiotic Coccidiostat. Non-medicated feed was unavailable!