I like separate Oyster, Grit and Scratch. Makes it easy on the birds to choose what they want. With a Mix, like above, the birds will sort through and make a mess as they use their beaks to flip the stuff they don't want or like, all over the coop or run. I have a pair of injured girls in the house. We mixed sunflower Seed with their feed. We ended up with sunflower seeds all over the table and floor around the feeder. These two just don't like them...JJ