Put the calcium where the chicks can't get to it. excessive calcium is very bad for chicks. I had this situation come up this last week when a broody hen of mine surprised me with 4 chicks! I am not feeding them medicated chick feed because the chicks have already been exposed to everything , being hatched in the coop. Besides, I am not sure medicated chick feed is good for the adults. I used Purina Start and Grow unmedicated in the yellow bag. This week I bought Purina Flockraiser which is good for all ages ( including chicks) and it is 20% protein ,which I really like. Honestly, I have my chicks with their mama hen and I don't have any calcium in there with her. She is busy raising chicks now, not laying and I worry about the chicks getting ahold of the calcium chips. I also put Goat Nutri-Drench in their water ( 2ml for a one qt. waterer) for the 1st month to get them off to a strong start. It is great for the adults too. I think it is an important nutritional supplement.
Best Success,
Karen