I forgot your question about supplementation. You can use a light dusting a couple times a week. It's very possible to overdose on D3 which is toxic, so you don't want to overdo it. Most of his calcium and vitamins should come from a balanced, varied diet and a good quality UVB light (or natural sunlight), so you don't have to rely as much on supplements.
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Torey
Eugene, Oregon, USA
1.1 Saharan Uros (Joe and Arthur)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
1.1 Collared Lizard (Ripcord and Rorschach)
2.0 Green Anoles (Bowser and Sprocket)
1.1 Chubby Housecats (Roscolux and Jenny)