I think it's a matter of preference and what the circumstance is as to how many chicks and where they're housed. I never used medicated chick feed because I never had more than two chicks at a time and we cleaned their bedding 1-2x a day. However, if there are a LOT of chicks and running around in a small space then medicated chick feed might be a good idea. I and my chicken friends are organic thinkers so the less medicated/antibiotic stuff we use the better we like it but again a matter of preference dependent on how crowded the conditions. I wouldn't use it much after 3 months old because coccid is more a chick ailment then juvenile ailment. I like your thinking to do what you think best for your babies. It's a commitment just like a puppy or kitten would be and everyone has different ideas what works best. You choose your best method - Smiles