For my chameleons and frogs I limited there use of calcium of D3 to twice a month. D3 is used for reptiles and amphibians which are raised under UVB/UVA bulbs. Im not sure but i think for more nocturnal phibs, its not completely necessary for use. For all my older animals I maintain a supplementation schedule of cal w/d3 twice a month , multivitamin twice a month and for regular calcium either three times or twice a week (frogs may not require as much calcium as reptiles)

Hope this helps