We are so excited we just got our first egg today! My chickens are 5 months old and 1 out of 16 gals laid an egg. Should I go and change feed now to layers mix or finish bag of Medicated starter ( amprolium) ? We plan to have baby chicks too with some of these so I could always use the starter mix or maybe the others won't lay for another month? I think atleast I need to get some oyster shell right? TIA!