Red Sea Peninsula 500 new owner question. I am setting up my tank now. I have a Maxspect Gyre XF 330 - what will be the best placement for this? Horizontally on the weir about 2 inches below the water surface? Will I need a powerhead on the opposite end of the tank to assure optimum flow? The tank measures 48" long and is 24" wide and 24" deep.