I am relatively new to raising chickens -- about six months. The feeders that I have are store bought cylinders with a round trough undernearth. I imagine this style works great for pellets, but I have been feeding my chickens an organic ground grain, and the grain doesn't slide down to the trough like pellets. As a result, food doesn't load properly. Is there a better delivery system, or is there something safe that I can coat the inside of the cylinder allowing the grain to slide down?