I'm about to place a big food order with Countryside Organics, and I want to get their scratch too. My question is, how much do I need? How much will I be giving them? I have 5 chicks. Is 50lbs too much to have around? And do I really need grit? Isn't natural sand and dirt enough? I plan to order enough food for at least the next several months to make the delivery worth my while. Thanks! One more....DE...how much of that do I need around?