Agreed. I had a 2 inch bed with no NO3 detectable. Dr. Ron "cohersed" me into adding sand to get 3 or 4 inches, as this was "better".....After 6 months with the deeper sand, I see no difference at all. To do it again, I would use 1-2 inches in the display tank and add it after the rock. That way portions could be removed down the road without tumbling any rock piles.
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Brad
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