I have one run and coop with two different age groups in them. I have three 6-7 week olds, and six 4 week olds. Unfortunately I am about out of starter crumbles, and realize the that older chicks are about at an age to switch to adult feed, but the younger ones aren't there yet. Since I can't separate them what should I do, buy another bag of starter, or switch to grower? I have a feeling I should stick with the starter for another bags worth, but I am too new to rely on my gut reactions. Thanks