From what I have read, the Wavebox will work fine from the corner even if there a rocks near it. I guess it has more to do with the sonic resonance of the tank than actually pushing water. As long as it is pointing down the length of the tank, it should work fine.
I was reading about an experiment where the wave box can actually run from outside of the tank in a small glass box attached to the side of the tank with only one small hole. Ill try to find the link. It is pretty neat.
We will see though. Ill report my findings here and let you know. Worst case is I have to move the rock out an inch or two.
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