Return Pump

[fishman1234]

I am in the process of setting up a 125 reef with a 55 sump. i ordered a hang on overflow box that runs at 1500 gph. what size return pump would be good for the aquarium?:bounce1:

 

[SkiFletch]

http://reefcentral.com/index.php/head-loss-calculator

Choose your return plumbing size (I would suggest at least 1.5 inch), input however many fittings you'll have, and start playing with pumps to see which one gets you just a little under 1500gph.