I need help with some extra calcium for my moms flock, I started doing my own flock because I got attached to helping her chicks when she was out of town. Some of her chicks need more calcium due to there eggs soft spots I noticed this week. I want to learn the best ways for my own chick flock so this doesn't happen. My chicks are 8 & 9 weeks old now. What's good calcium sources? Whats not good for my flock to eat? What's good treats?