Thanks Gresh for sharing these invaluable info! The coral feeding article alone is mind-blowing for me, it answered lot of questions which has been disturbing me in the area which I consider most complicated and confusing in reef keeping.
For one, if you ask the question 'what should I feed my corals' in any public forum, you will most likely get 10 different answers from 10 different people, varies from 'I don't feed anything other than fish poops' to 'here are 10 things I feed to my corals' (now I know these answers are all correct and all incorrect). But if you ask 'what light should I use', you will certainly not get answer varying from 'I don't use any light at all' or 'here are 10 lighting sources that I use, alternate on daily base'.
For two, I can never image coral feed on some of the sources without reading the article with scientific studies behind it. For example I have always wondering how come fish poops alone can meet the requirement of coral feeding, you know when those people say they never feed their coral other than fish poop, esp. some of them have huge tank with gigantic healthy colonies, I keep wondering how much can fishies poo, and how much are obtainable by corals v.s. lost in filtering system. Now I understood more determined factor in this case are probably fish pee (but literally nobody say that), plankton produced by huge and seasoned aquarium, and PO4 in the water.
For three, I have been always suspecting that corals feed on PO4, from my observations, but I keep denying my thought, cause I thought PO4 is almost zero in nature reef, how come corals feed on it. Now I know corals adapt and learn how to feed in new environment, this also explains why some corals never grow in my tank (cause these are ones never learned how to feed in my tank) and why captive bred corals are easier to keep alive (cause these are ones that already learned how to feed in home aquarium), and importance to provide diversity of food source for corals.
Anyway I could be wrong and the article could be wrong in many points but more important is right on concept, after all not everyone is as lucky as those who have wonderful tanks of corals because they just did everything right, without realizing some of keys to their success.