Does anyone have any experience with the new Speedwave DC Controllable Pumps? So far, I've seen nothing but good reviews on these. Looking for more flow so i'm looking to replace my MAG7 as a return through my 58 gallon in the near future. Is the GPH that they list the max or minimum gph? Not sure if I need more coffee or what but I can't read the graph here. http://www.aquariumspecialty.com/speedwave-dc-controllable-pumps