I switched my 16 week old chickens to what I think is pellets. The bag just says layer feed. They love the larger pieces but they leave all the finer pieces. I read that I shouldn't keep just adding more food on top because the finer pieces will get stale and eventually moldy. I probably have 3 cups of the fine particles. How do I get them to eat those finer pieces because it seems like such a waste to dump it? I have tried just not refilling but I dont want to wait too long with them not eating.