I'm also part of the dart + OM 4-Way club as my return system and then I have a mag 12 pushing water through a spray bar in behind my rock. In total it should be about 29x/hr or 3500gph in a 120gal. Most of the water flow is focused to the center of my tank where I keep my acropora. Surrounding them is a combination of clams, LPS and less flow demanding SPS like montipora.
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