Please help. This is my 2nd year with chickens. My 4 girls from last year are great and this year's 3 chicks are 9 weeks old. They have just finished their 1st bag of chick feed. When I move them to the big girl coop, is it okay if they eat layer food? I buy crumbles. What do I do? How can I keep 2 different feeds in the coop? Thanks!