Did you feed chicks only the moist cornmeal or where they also allowed to forage? For me, the corn meal can only represent a portion of what the chicks eat, especially the younger ones. Such is very far from being nutritionally complete.That reminds me of years ago. My grandfather always had several hunting dogs. He never bought dogfood. The dogs were fed "dog bread" and what few scraps were available. Dog bread is mainly cornmeal and water and probably some kind of grease. I've made it myself when I have ran out of dogfood and sometimes cook the table scraps in it too. When I was a kid we never bought dogfood either. The dogs ate table scraps and occassionally dog bread.
Chicks were raised on moist cornmeal.