Last week, my husband built a couple of 4 inch PVC pipe feeders and installed them in our coop. Our chicks are 4 weeks old, so I'm not sure if this will still be an issue as they get bigger, but within a few hours of installation, our 7 chicks managed to kick out ALL of the food that was in the feeders. Maybe it tastes better after they poop on it? Maybe they were searching for a free prize like in the cereal boxes? I have no idea, but like I said, they're jerks. 
I've seen other PVC feeders with some kind of half moon shaped piece to keep the feed from being kicked out, but I'm not sure what piece is. Any ideas to keep the feed IN the PVC feeders instead of on the floor??

I've seen other PVC feeders with some kind of half moon shaped piece to keep the feed from being kicked out, but I'm not sure what piece is. Any ideas to keep the feed IN the PVC feeders instead of on the floor??