I was checking out the Orschelns feed and noticed that there was not much difference between the all purpose poultry feed and layers. I have 5 wk olds mixed in with my layers (they all free range all day too) I have been mixing the two feeds so that they all get what they need. I also noticed the chicks eating the oyster shells. Isn't that bad for them? Is this okay? Will be checking with the coop tomorrow ( for one feed for all ages and duckies) and buying from them maybe since Orschelns no longer have the reward program.