Another idea is to get two smaller ones. With some space to get between them. Reef and FO, or FW and SW, or planted and SW, or species and reef, etc.
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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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