Flow for 350 gal.

I was reading somewhere on here about flow on a tank. I'm thinking it said somewhere around 20-40 percent per hour. That would mean 7000 to 14000 gallons per hour on a 350. Is this correct? And does this figure include total water volume or just tank volume? I've been looking at sequence pumps, and I've thought about getting 2 sequence 1000's (5000 GPH) for closed loops, and then a quiet one 9000 (2328 GPH) for a return pump. Does this sound like it will work out ok? Any opinions? Are these good pumps? Anything better for the price/comparible GPH? My tank will be 72X48X30.
 
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