Ok lets say I go with the 1200 gph flowrate in the sump (only in the sump). Is there a way to figure out the sump size based on this flowrate? You would not run 1200 gph flowrate in a 10 gallon sump, right?
Well you could....but it would be a little ridiculous. Along with flow you have to consider the tank it is suppose to be filtering. I would say roughly a 30-40 gallon sump. If you could fit bigger personally I would go bigger. On a 120 a 50 Gallon breeder sump would look great