I could not find that article about six month ago when I looked - it is like it disappeared, but all of the references to it still exist. If you have a link, I would REALLY love it store it. IMO, it was highly suspect. First, they used fish that NEARLY NOBODY keeps in their reefs - a kind of tang that is really fragile and susceptible to disease. Second, they would not tell anybody what they fed them, only that it was "high quality." I have no doubt that those fish got HLLE and that they ran carbon. There just did not appear to be solid causality. I also have seen hundreds, or more, of anecdotes from hobbyists that run carbon with no issues for decades - myself included. This article, to me, was even less useful than the ones that Riddle uses to talk about all corals in general based on Porites - I have had Porites thrive in my fuge under 75W incandescent light bulbs and have little idea beyond academics how this applies to other stuff in the real world that never would survive this.