We get that questions asked all the time and unfortunately the only one that can really answer that question is you. Every tank has different rock work, coral growth, fish, sand depth that there isn't a one-location fits all. All we can tell you is to test, test, test until you find something that you and your corals like. We usually recommend placing the pumps on opposites end of the tank and have them face each other. Use that as a starting point and then go from there.