It's not really that "new" per se. Sugar-fine aragonite is nice stuff because you don't need as much of it to create anaerobic zones which is where the denitrifying bacteria reside. So theoretically resulting in lower (or zero) nitrate levels. But basically without trying to get too much into the "sandbed versus no sandbed" debate, sand isn't the only place denitrifying bacteria can reside.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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