I just put two 6000 on a double controller and thought I did th eset up by the book. Maybe I just did not get it right, or something. Both pumps are mounted on opposite corners of a 215rr, one left front, one right rear, facing pretty much at the opposite end of the tank. They both are running, but I am not certain about the setup on the controller, if I am getting maximum power when htey are supposed to be at 100%. I want them to create a variable flow but at times be at 100%. And as they sit right now they certainly do not seem to be strong enough, and was wondering if it was me or do I need to upgrade these to the 6100?