I have 5 chicks they are all about 2 1/2 weeks old. I just started giving them treats things like smashed boiled egg, finally chopped bits of apple, and some small very seed pods. I have a dish of dirt in there coop it is a mixture of extremely fine and a little corse. A few of my chick started having diarrhea yesterday is this just because of the change in diet or should I be worried. Also will the dirt work for grit or should I look into something else. Thanks!