You can give them calcium every other day, 3 days per week on half their feeders I usually dust the morning batch and not the afternoon feeding, just my preference. I don't use reptivite but if you go very very lightly it could work I personally only do once a month with Repashy Cal + LoD until they are 6 months then I go twice a month ~every 2 weeks in place of the calcium with bee pollen I use daily. They are so prone to problems when they are little I don't want to over supplement them.