I know some people use sand, and another lovely person suggested the fine stuff in the bottom of a bag of adult grit, so I bought some today and while the shop person said it was the fine type of grit rather than coarse, it is still rather chunky. It contains tiny little spiral shells, about the size of the crumbled chick starter they are eating, but i was wondering if i should try to crush it further or if this texture would be okay for them? I gave them a little just to see if they would like it and one chick could not keep its head out the dish! It was so excited about eating it that i ended up taking it away incase it wasn't suitable and it ate too much and made itself sick. Any suggestions please? I tried to take a photo to give an idea of how big the bits are but it didn't really work so I wont bother posting it.