Hello I have a Red Sea ReefRun 5500 DC Pump on my Reef tank and I have about 4-5 feet of head pressure through the plumbing. My question is if I want to achieve about 530-550 GPH what intensity percentage should I set the pump? This pump has a flow rate of 530-1450. Is there a way to ballpark this without collecting water from the return nozzle into a gallon jug?