My current tank setup is a 180 gallon (6'x2'x2') mixed reef. I have four large rock pillars that are centered in the tank and equally spaced, with the smaller two forming one in the middle I have two Tunze 6105s that provide the flow, along with 4 loc line nozzles from the return (Waveline DC-6000 pump)coming out of the center overflow. I have the nozzles facing up to the water surface, so I dont have too much water backflow when I turn off the return pump for water changes. The Tunzes are currently positioned behind the rock pillars facing inward and upward to create surface turbulence and chaotic flow (colliding with return flow and also anti-synced with opposite Tunze I am questioning if I have the Tunzes in the best position for my reef. I get good flow, my LPS rock back and forth, but I do have some semi-dead spots in the front corners. Good for feeding without having to turn the tunzes off, but bad for corals and algae outbreaks. On other tanks I notice that the powerheads are positioned in the middle of the reef (front to back) and normally blow over the "face" of the reef, if the reef is built on the back of the tank forward. Since I have space in the front and back of the tank, what is the best way to position the Tunzes for optimal flow, where I'm not blasting the rock directly with the power head?