I know of Repcal but not Reptical so not sure what you got there. you have to dust your feeders everyday with Calcium just plain calcium, no d3. Use Calcium with d3 a couple of times a month. And you want to use a Multivitamin a couple of times a month also. It really wont change as they get older. Just when they get older you feed them every other day so you will dust with the plain calcium at every other feeding.