I'm fairly new to salt water aquariums (had fresh water for many years) but my understanding is 5 to 10 times the display tank volume through the sump plus an additional 10 to 20 times the display tank volume inside the display tank. Total display tank turn over of 15 to 30 times per hour. For your set up that would be 1,350 to 2,700 gph through the sump and another 2,700 to 5,600 gph inside the display tank. It is best to limit the flow through the fuge to much less than the flow through the sump.
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