I am looking into adding freeze dried bone, Microcrystalline Calcium Hydroxyapatite (MCHA), to trade off with the egg shell calcium. I won't use it often, but since the more variety the better in diet, this will help round things out.
They are all getting a little bit of bone-in meals now, both the ground bone in Stella &Chewy's a couple meals a week and prey model raw bone in meals once a week or so. The MCHA will just add a little more variety.