This winter my sulcata is camping out in my garage, with a 150W ceramic heater in a watering trough filled with hay. I'm wondering if I should use Calcium w/ Vit. D3 or w/o D3? He will not be having UVB this winter. But he lives outside in the summer and gets plenty of sun.
Also (I should only use Calcium (w/o D3) in the summer, correct?)

