Roger, I read through most of the posts over the past month trying to get an idea of what would be best for my tank and I must say I am still stumped. Right now, I am getting about 800 gph out of my return from my sump and about another 900 from 3 maxi-jet 1200's. I want to replace the maxi-jets due to their high power consumption (at least in my opinion (20 watts each running 24hrs a day)). I thought about trying out a single 6060 and then going from there. What do you think? Any suggestions would be greatly appreciated. Thanks, Patrick