so if i read it right you only have 4 powerheads on the non viewable side of the tank nothing eles
Almost...but not exactly. The Tunzes powerheads are all on the non-viewable end, as you say. But the return line from my Eheim 1262 pump is positioned at the front (viewable) end of the tank. It runs through a Wavy Sea oscillating return device which is pointed back towards the powerheads on the non-viewable end. Compared to the Tunzes, the amount flow through that pump is not very much (I am making a guess at around 700gph or so?). But I thnk it helps with randomization of the flow and keeps things moving pretty good.