I'm having no luck whatsoever finding a distributor that carries the black 3M colorquartz sand (I live in NC). Some alternatives that have been suggested to me have been Flourite Black Sand and Black Tahitian Moon Ssand. Has anyone had experience with one/both of these? I'm currently using regular pool filter sand and like how quickly it settles if disturbed, but have decided black would provide a better contrast for the fishes' color (it's a salvini tank).