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I have had tanks with great flow and no flow and I have found that my paly's and zoas do MUCH better with a nice constant to erratic flow. I measure the amount of flow on how much the polyps move and how the skirt reacts. To me too much flow is the point to where the polyp struggles to open and the flow keeps it half shut. I feel like mine do best when there is a medium, erratic flow to where you can see the polyp every once and a while move on each side, but to where the poylp can stay open. Maybe even a slight constant movement.
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