You're fine. I'm not sure what chert rock is, so have no idea. I only feed commercial chick starter. But I did start my chicks out with GroGelPlus. It was awesome. I had one chick that was just stumbling around and I was worried at first, would not eat or drink, but once I put the GroGelPlus in there it got interested in that and was fine. It is a vitamin and mineral supplement. I also add Quik Chik to their water. The only thing I know is do not use newspaper with chicks. It gets too slippery and they have trouble standing up, could cause spraddle leg.Hi, I may be using the wrong thread to ask these questions but as a newbie with spotty Internet service and being busy preparing for my first chicks in eight years, I still am not great at navigating here for finding information. I guess I just need pointed in the right direction. My chicks are all doing well so far , different groups, my standard chicks are 4-6 days old and I just got tiny bantam chicks yesterday . A question I have is about bedding. There was a post on using sand and until I can get some I was wondering if white chert rock would be alright.? Also any homemade chick recipes that are really heathy? Maybe boost up my smallest Bantam. She's not been the strongest so I'm taking extra care with her. And I was wondering about using regular top soil as a bedding or just making them a small box to scratch around in. Also handling. They love it but not sure if it's to soon or how much with the bantams. Again sorry if I made a newbie mistake posting in the wrong place but they said it right," this site is like Disneyland " and with my home computer being down I am limited to my phone which is not always cooperative. Thanks