I use the OM wavemaker too.
My inlet pulls from the lower middle of the tank.
My 4 outlets are at the top... one in each corner and then two in the middle like below:
1 2 3 4
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I use 45º outputs so that the outlets point down and across the tank. 2 in one direction, 2 in the other. This gives me a good rolling current one direction that then switches to a rolling current in the other.
This is on a smaller 120 gallon Cube.
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