I bought these layer feeds to prepare for my girls. Now I am thinking I would rather have gotten all flock. I have four 15 week olds and four 5 week olds. All female. I would like to feed them all the same thing so that I don’t have to worry about each getting the “wrong “ thing. I still have quite a bit of the chick starter crumbles, which I am feeding all. Here’s my questions: when do I start to feed the layer feed to the older girls? Can I just give the chick starter crumbles and switch to all flock for all of them? I know I need to give oyster shell as a free choice, the ones that need it will take it and not if they don’t, right? I am going to see if my local TSC will let me take the two pictured below back and swap out for all flock. Any advice is appreciated. Trying to do it right, but it gets very confusing.