I have a ELOS 160XL and I have 3 6105s attached to the overflow. One creates turbulence on the surface. One is mid tank, and the other is for lower water movement. The tank is too beautiful (and expensive) to be full of pumps. The key is your aquascaping. I have no detritus in my tank and all. The pumps on one side produces a circular current around the rocks. The key is your aquascape. If you have an open design it works and looks great. There are no dead spots in my tank. This is a picture from about a year ago. I can post newer pictures from other angles if you like.