That is good. I think as long as the chickens have grits it should be hard to over feed them mealworms. The biggest concern might be with a mass amount of hard shells being digested but you can always breed them till they pupate and then feed them. They will be soft without hard shells and just as good for them. Mine even eat all the dead beetles from my breeder trays or you can toss the dead ones in your garden of use when potting a new plant. It adds a good amount of chitin to your soil which is like using crab meal or frass in your garden and really ramps up your plants natural defenses and helps grow thicker heathier stalks.