I have two 9 week old chicks, and I am getting four hatchlings on June 17th. I will be putting them together when my first batch is about 20 weeks and my second batch is about 10 weeks depending on how they interact in the seperated runs. What would be the best way to feed two age groups like this? I have the 9 week olds on all purpose grower, but: A.) Would it be easiest to change 9 weekers back to the chick starter so everybody is eating the same? B.) Can I feed chick starter until I change to layer crumbles? With no grower in between? C.) Would it be a bad idea to mix the grower and chick starter together and feed the two groups that? D.) Is it bad to go from Starter, then grower, then back to starter? Will I harm them? Any advice would be great thanks a ton. I know this is early, but I am excited and want to learn all I can.