I have 3 chicks that I will be putting out with my 1 year old golden buff next week, as they are pretty well feathered out, and will be 8 weeks old. They have been on starter crumbles, and my other birds (2 will go to freezer camp next week) have been on Layena pellets. Would it be ok to switch over to Flock raiser until my pullets are 16 weeks, and offer free choice oyster shell, so they are all on the same feed? Sure would make things easier.