In my coop/run outside I've got my two 'new' Partridge Silkies (approx 1yo & 2yo), who are eating Purina's Layena crumbles. Inside in a spare room, I have two 1 month chicks (1 EE and 1 BR) in a 100 gallon plastic stock tank. They're eating Purina Start & Grow. The chicks will go outside after the Silkies have been here for 2 weeks (quarantine for safety), on about August 28th. The coop & run has 2 sections that can be separated by closing a small door. That'll give them 2 weeks to get used to each other safely. At the point I put them all together, on or about the 12th of September, I don't know what to do about their feed. The Silkies need their layer food, and the chicks will need the Start & Grow for about another 10 weeks. I know that the chicks should not start eating layer food before they're at least 18 weeks old. How can I manage this upcoming problem?