I have been in the hobby for a decade I've tried all the pumps and powerheads out there, after ten years of trying to make closed loops work right or powerheads aim in the right direction I finally gave up, I dropped a grand on a 2 tunze 6100's with a multi controller, It is basically plug-n-play. totally upgradable or downgradeable 1,300 gpd to 3,100 gpd, you can put these things in a 75 gal tank or crank it up in a 300 gallon tank also comes with a moon light and a photo cell, I love these things! well worth the money AND the marriage-IMO. (o.k. maybe not).