I am 5 months into chicken ownership and cant thank BYC enough for starting this post!!
... The chicks love most, but at the end of the day there would be a fine layer of something black left at the bottom. They would pick everything else out. I am worried they are not getting the nutritional balance they need for egg laying.
... they still are picking out what they like. Like one other person who posted, i figured if I reduced the food amount, and they were hungry enough, they would eat the "bottom" of the bowl, but they didn't. Maybe i didn't let them get hungry enough.
My chicks are picky. They either like something or they don't. They run after a grape like a crazed soccer player, they completely ignore meal worms!
They have free choice oyster shell.

One of my chicks laid their (and my) first egg today! I know what my chickens eat go into the eggs, so I am really am trying to get this right

Wonder if I am brave enough to try to make my own food some day........
Lots of great info on this thread. Thanks all for sharing.