I will probably end up trying to make my own. It will just depend on how the tank is set up currently.
As far as flow, I have 2 koralia nanos, 1 @ 240 gph and 1 @ 425 gph. I will probably upgrade them to a vortech mp10wes, so flow in the display isnt a problem.
If I set it up for 300gph overflow/drain would I need something that is more, the same, or less for the return?