Just received an e-mail back from reeflo. It looks like the dart is currently putting out about 1,600 gph through the ugj system. The new pump is going to put out aproximately 3,000 gallons through the ugj system.
I will be switching the dart over to a diy spray bar that will be putting out approximately 1,800 gph. That will allow the tank to be filtered approximately six times per hour. The overall turnover rate of the tank should be about 16 times per hour unless I need to dial it down using ball valves.
I shouldn't have too much of a problem with debris and waste settling on the sand.