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your Iwaki is a pressure rated pump.
you can restrict it's ouput but never restrict the intake of any pump. In order to avoid restricting a pump's output you can build a manifold that recirculates water through the sump (in addition to the return plumbing.) You might also divide returns between your bottom spraybar and the top returns.
The best soultion (IMO) is to increase your drain capacity so that you can run the Iwaki wide open. This might mean using two overflow/drains.
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Current Tank Info: 84x24x30 265g reef past TOTM honors
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