I just found out that 4 chickens that I bought from someone on craigs list are actually 4 or 5 months younger than he had told me. They are in with laying hens and are most likely 15 or 20 weeks old. I'm thinking because of their age they shouldn't be eating layer feed but since I don't have a second coop I'm not sure how to feed them different food than the olde birds. Any suggestions?