Chuck,
I'm relying on the LR in the tank and the 20lbs of nano rock that sits between the bubble traps inside the sump; no remote DSB or anything else. I have no way to actually prove this, but my thinking is that 100lbs of rock with high flow on all sides is just as good as 200lbs of rock stacked into a pile with little to no flow. Also, I do not have a tank full of fish, so the need for the additional biological filtration is diminished. Add all that with a high water volume to dilute any potential wastes and things should be good to go.
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