Gee you guys make me not feel like I am overdoing it with my 5500 gph of flow in my 120 gallon SPS tank. That is 45.83 times per hour turnover. But my 120 gallon tank with 40 gallon sump only holds 105 gallon of water due to a 5 1/5 inch deep sand bed and 140 pounds of rock and only 7.5 inches of water in sump. Thats a 52.4 times per hour turn over. One sump pump, two closed circuit circulation loops, with eight 1 inch return lines exiting through 3/4 inch adjustable lockline nozzles screwed into 1 inch bulkheads. Two returns on each side and four back wall returns. A back wall overflow with 2 two inch bulkheads feeding the sump with both a 1 1/2 inch and a 2 inch bulkhead 9 inches up from the bottom on the back wall from for the closed circulation loops. Lots of glass holes and lots of PVC pipe, valves and unions. It is easy to tell I have no wife to control my spending on reefing. What detritus, every thing that is small is in suspension in my tanks. I do have to put a layer of 1 to 2 mm substrate over the sand in some of the tanks I set up, always on my own tanks. Admittedly I am now running higher circulation rates than I ever have before, but I have lowered my water velocities.
