Ok, thats what I was thinking too. I'm currently using about 1/4 inch riverbed sand in my 55 gallon tank. I have not detected anything bad in the last 5 1/2 months.
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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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