Quote Originally Posted by sanchini
I'm trying to grow vertically using a low power setup, my current design has to move the water up to around 5-6'
Most pumps you see in shops or advertized online show max head and flow rates at different heights. If you interpolate, you can guess close to what the flow rate would be at your desired height. You can always throttle back a "too-powerful" pump by restricting the output with a valve or diverting part of the flow back to the fishtank. Better to have a pump rated for more than you think you will need than one rated "just enough".