Ok so ive had my 500g running for about a year. My main filter is a 100g sump, reeflo hammerhead gold pushing about 5000gph through a 5' spray bar. It does on moving water around but im thinking of cutting it off. Just leave the return dumping from top back left corner aimed ward the middle front bottom. What do u think? i just want a bit more flow, but its all glued so if i cut the spray bar off ut wont b going back on. Im thinking of cutting the elbow just above the water.