Normally one doesnt feed calcium powders directly to the feeders.
Further, bone meal usually contains phosphorus - which you do not want. May also contain preformed Vitamin A and D, which I wouldnt want to gutload with
I'm digging wayyy back in my brain here, but i think I remember reading years ago bone meal was often used in plants/gardening for some reason?? I could be wrong, but worth a google - chams & plants go hand in hand.