So I'm in the process of planning my 180gal build. I'm going to have a 125gal sump under it. The tank is drilled for 2 returns. I'm looking at the fluval sp6 for the return pump. Would this pump be adequate for pushing both returns or should I get 1 pump for each return and run them independently. I'm going to have approximately 7 feet of head. With the return lines being ¾". Other pump recommendations are definitely welcome, it will just need to be a submersible pump.