I have two 400watt radiums powering my reef. I dropped my DT photoperiod to 6 hrs. Opposite my scrubbers 18hrs. Only then did my scrubber start winning. Now I'm upping my DT lights back up to 12 slowly. I feel I could run 6 hrs as the intensity I have makes up for long photo hrs. Had some browning to my SPS. But their color is coming back better than ever. Need new bulbs soon. Hitting the one yr come November -_-

As for my scrubber, it's a standard(?) acrylic box with three 1" bulkheads to even flow out at the bottom. Lighting consist of 4 23watt PAR 36 outdoor floods. They're 4" from the 10x10 screen. Flow is done with a QuietOne 4000 at zero HH.