I just went to the website and followed through the specifics. Very interesting techniques and there's no denying the results. That's a phenomenal looking and very successful reef tank.
If I could recommend one small piece of advice that (In my personal opinion) would be the only way to make any kind of improvement on this tank .... please feed that Hippo Tang. I can't get a sense of how thin the Clownfish is, but there is one pic of the Hippo that shows a very thin fish.
He's looking very emaciated from what I can see. It saddens me to see a fish that thin. I can see the outline of the internal organs! That isn't thriving, that's barely staying alive.
Even a small amount of thawed frozen spinach (Tangs need vegetation) daily would help to put some meat on it's bones and wouldn't load the tank with proteins. 5 or 6 Mysis shrimp at least every other day would be nice too. That is a large fish by nature and denying its growth contradicts what reef/aquarium keeping is all about.
Otherwise, trading it in for a Blue Damsel would be good.
Sorry to be the only one with less than a totally impressed comment, but besides that, I'm very seriously impressed.