There was a thread about 2 weeks ago on this.
Basic concensus seemed to be that it moves a WHOLE lot of water for you, all throughout your tank nicely.
They are expensive, and take up a good amount of realestate in the tank.
Your water volume will surge back and forth so much, 1.5" difference from the waves.
It is hard on tank, I think they say 10% reduction in tank "life" due to stress on joints from so much water movement. Even harder on bow fronts.
They are most effective on longer tanks where the waves can "build".
I have seen the one at J&L in vancouver, looked awesome in action!
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