I have just started raising chickens. We have 4 Silkie Hens and 2 bantam Hens. When I ordered my silkies I paid extra for the medication and then fed them 3 full bags of medicated feed. I am just learning about feeding etc. and what is best and most healthy for our friends. Our chicks are about 4 months old now and I am moving onto all purpose feed. Please advise with brands, timeframes or any helpful advice.