He has to get his calcium with D3 powder because you don't have a uvb florescent bulb. You use calcium with out D3 if you don't use uvb bulb. Also a good reptovitamin is good to use every third feeding . Today I took them out for some sun again. I don't use lights for my frogs. I use uvb/uva ,and a heater ,for my turtles. Frogs are easier on the pocket when it comes to the electric bill,lol.