I'm new to chickens and I went a little crazy this spring. I have a flock that age ranges from 3-6 months. My Older pullets have started laying and I'm wondering how to give them the nutrition they need to help them lay eggs? I'm worried about putting lay blend out there cause I have heard that it could kill my younger pullets and cockerels, is this true? I have free choice oyster shells out for them and they are on Grower Blend, Scratch, and I throw down crumbled corn in the mornings. They are also free range so they eat grass and bugs and stuff haha, not to mention anything out of my kitchen. Does this sound like enough for them or should I be doing something else?