That is a beautiful display!
Looks like everyone is thriving and happy, from corals to tangs. Got some muscle under the hood, too!
I found that my nitrates (in my current heavily stocked 65 gallon setup) came down somewhat with NO3-PO4-X, and dropped even further when I started using "Vibrant" to combat a nagging Bryopsis problem. Others have had very different - and somewhat widely varying - results from Vibrant use.
~Bruce, who's building a system the same size, but with a 40B sump . . .