AncientDNA

I've used calci-sand before without much trouble, but I prefer aspen chips. It's cheaper, easier to clean & work with and is odor dampening.
While some rosies will inhabit sandier areas, they tend to live in rocky outcroppings, loose leaf litter, agricultural areas, etc. In fact, I think I remember reading somewhere that sand was a barrier to rosies.
Have you seen this review of substrates?
http://www.rosyboa.com/substrate.htm