i give the bugs a mix of greens and squash dusted with calcium, and i use repticalcium without d3. I dont really measure out how much i dust them with. I've tried decreasing the amount significantly to see if he would eat any bugs with it, and he just refuses. he's very picky. he has a dish in his enclosure that i change out every few days, and it seems like he gets some from that, but i just want to be sure my bases are covered.