Return pump

I recently puchased an Eheim 1262 (900 GPH) for the return on my 180. After a ton of research, I learned that if you are planning to utilize a sump, it is best to only run 3-5x turnover for your tank. This allows more contact time for your skimmer and other items you might have in your sump. It also decreases the chance of microbubbles returning to your tank. I took the middle and calculated 4x180 which came out to 720. I will add extra flow in my tank by using tunze or seio's.