I built mine similar to that design. I did not have the room to house such a large unit, so I scaled it down to fit. I made a few revisions to the original plan to simplify the construction too. I've had it running for a year and a half now, and its terrific. It hold one full container of ARM media, and that lasted just over a year. These pictures are from when I first set it up. I've since changed the CO2 feed a bit, and have added a ph probe for my controller.

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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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