[bertoni]

I agree that there's lots of nitrogen available in our systems from the air. Some species of cyanobacteria can fix nitrogen from the air, but it's never been shown that they do so in our tanks, not to an appreciable degree. I don't think that denitrification is the issue in dinoflagellate problems.

I agree that part of the problem might lie in symbiotic relationships or microbial films, but I don't know what we can do about that. As stated, controlling bacteria and keeping the reef tank alive is going to be difficult to impossible.