I use my two mp10s @ 20% in "lagoonal" mode on my 40b. My euphyllias and mushies really object if I go higher than that. I don't have a whole lot of rock in it, and there really aren't any areas with lower flow then the rest of the display. The setting I've got them on keeps food nicely suspended and moving around the tank.
My SPS aren't overly happy with the setting, but they're getting a new tank.
Your setting does sound high, but your corals will let you know if that is really the case.
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Shelley
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