I've heard that sand might cuase an anaerobic environment(no oxygen for those who don't know) therefore cuasing an increase of sulfur or other noxious chemicals in the substrate. I'm not to sure, it sort of makes sense, but then how do salt water aquarium keepers do it?
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"Kings made tombs more splendid then the houses of the living. And counted the old names of their descent dearer than the names of their sons."
-J.R.R. Tolkien
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