I dust with Rep-Cal calcium w/D3 and Herptivite. I feed crickets once per week (sometimes less) and dust every time. If you feed crickets twice per week you can still dust both times. If you feed more than that I would only dust with the Herptivite for the extra feedings, but really you don't want to be feeding too many crickets because the CGD should be the main source of food and nutrition.