Wow that's alot of food. You probably hit it right on the head. Most of my sand bed is 3 to 3.5 inches. I was originally shooting for 3.5 minimum but I think some disolved and I lost a bunch during syphoning. I vacuum about the top 3/4 inch weekly and have had some minor success.
So, it sounds like 4 or 5 sq. ft. of DSB is enough for nitrate removal.
I always thought any sand up to about three inches of sand was no mans land. Do you vacuum your 1 inch of sand? If so, how often?
Where do you think all those nutrients go? Growth?
Jack
Big whorls have little whorls, Which feed on their velocity;
And little whorls have lesser whorls, And so on to viscosity
Lewis Richardson in 1922
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