Well as my subject states I finally got my new Tunze system set up and running.I took Rvitko's advice and went with the 2 6000's and the multi controller. The reason that I am unpleased is because these model 6000's dont nearly have enough power or flow for my tank. I wish I would have went with my orginal idea of getting the 6100's. Other then that I think it will be a great sytem once I can get the necessary flow out of them. Oh well, back to the drawing board If anyone is curious of what kind of setup I am running this on. It is a 190g acrylic. The dimensions are 67" long X 24" wide X 27" high. I have approx. 420#'s of live rock.