Hi and thanks for answering all these newbie questions! We have 4 1-week old chicks. One has eaten a may fly already and we are all very impressed with her hunting skills! They are on regular medicated (they don't sell organic around here) starter, but we plan on letting them eat treats soon. I called the feed store to see if they sold "chick grit" and they were very puzzled by my question. He said they sell 50 pound bags of the regular "calcium chips" and 5 pound bags of the oyster shells. Is this what I am looking for? Or am I looking for play sand for sand boxes? Last night I was all freaked out about the may fly and that she ate, thinking that she's got no grit to digest it and was going to die. She was FINE this am. I'm a worried momma!