I have my feed in a Tupperware container with piping they have to stick their heads in so they can't spill it everywhere. I have 8 hens and 2 Roos, so I'm continuing to feed the 18% protein chick feed instead of layer feed so my Roos are not subject to calcium they don't need. I'm offering oyster shell on the side in a rabbit feeder so my hens have the extra calcium they need. Problem is, I fill it and they promptly dig it all out. Feeder is placed at eye level and secured to side of their run. Any ideas? What do u guys do? This isobar first venture with chickens. Just trying to prevent waste and provide what they need. Our second hen started laying today. Still waiting on the other 6!