Gangster- Answer-
Om my grow out 240 gallon 8 foot tank, I run a single FX5 but I built a custom spraybar that spans the entire length of the tank with drilled holes every 8 inches so the return water is evenly circulating in the entire 8 feet of tank. Plus the spray bar is just slightly about the water line so it jets fresh oxygen directly into the water so I don't have to run an extra powerhead or air pump. I am a Genius!!!
Nerd.