I have community areas. I have HRIR's, LH's, LB's and HDellies all in the same area. None really eat it. But as Long as there eggs are fine doesn't bother me. I use the $15 hog troughs from TSC for there food. On one side of the house I have Nutrena layer pellets and the other side I have 20% FF meatbird maker. I put 1 gallon of the different feed in each. Every morning it's all gone, so they are probably getting enough calcium from the layer feed.Oyster Shell - I have have maybe 20 pens right now. One never touches it, most have some usage but not a lot and then there is the one with my layer white leghorns and I have to give it to them at least once a week. I use a 1 pound coffee can so I know how much each pen is using. I find that certain breeds send to eat more than others too.