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lets see a full shot, wanted to see how you connected your 180 sump to your tank( I need some ideas). Also what do you mean "the denitrifier was enough to hold the 300 gallons of new water back from cycling"?
The build is amazing, I feel motivated to build something. You should have been one of the presenters at MACNA. You should teach a reef building class 1, 2, and 3 for hobbyists on different levels. Perhaps even create your own DIY videos on youtube.
I got mines form a local hardware store.. Home ddepot didn't have the type I needed..