I think main consern is water flow in the display tank :30 times or more for SPS is minimum, ( i am at 90 times turn over rate in the display tank, not counting the WaveBox and very little flow in the sump)
In the sump if you are circulating you water wolume few times an hour i think you are OK. Slow sump flow is good , in terms of letting you skimmer clean up the water better, i have maybe 90 g/h flow in my sump or less.
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