Well, I just added the two tunze 6080 units.
These are not variable using the controller and push 2250gph for a staggering 17w.
I already have two other tunzes, the 6100 (3,175gph -45W) and a 6200 (5000gph 62W).
The old units are on the right side of my tank and the new ones were added to the left to supplement the two seio 1500s on that side.
Well....I would like to say they made my corals sway back and forth but I cant. They kicked up so much crap the moment they came on all I can see are clouds. I have to admit, I was surprised at the flow they created. I think that since they are slightly angled to the others I created a circular flow in the system. This pulled every little bit of dirt dust and algae up from the rock and tossed it around. Even the areas under the eggcrate racking is getting cleaned by the suction into the new tunzes.
Im happy with the flow. Not too sure what the fish think.
I would post pics but, as I said, its kind of cloudy.
altogether I now have about 20,000gph total flow in the main tank.
P.