Check if your wavebox is not fully submerged, the top of the box has to be an inch off the water level. Also check your overflow box does not exceed more than half of the water in there. You also need to have another powerhead which is placed opposite to your wavebox then you will have a good wave that goes back and forth on both sides.
If your tank is 4 feet long, it will be perfect for getting a good wave as the user guide says.
That is how I set it up in my tank, hope it will help you a bit here.
I don't know if you have an old or new version of controller, the new one will give you a better wave too.
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