I am currently feeding my flock a commercial 18% protein layer crumble. I also give them cracked corn mixed in nightly and black oil sunflower seeds a couple of times per week. They get some table scraps, and I try to be careful that there is nothing in there that they aren't supposed to eat. They free range all day long having access to the entire property. Am I giving them what they need? I don't put out grit since they seem to completely ignore it and just spill it, but they have plenty of access to gravel. And what about adding food grade diatemaceous earth? Does it really help with internal parasite control, or is there something else I need to do? Thanks for any advice!