After reading the advanced aquarist article is seems the ULNS tanks may have the most benefit from adding AA's. Also, if our goal is to closely replicate a natural reef, regular zooplankton and phytoplankton feeding fits the bill.
The immediate PE extension may very well be the coral sensing the aminos. This however does not prove or demonstrate a deficiency, rather a feeding response. It seems likely for all tanks there is no AA deficiency and no proof of faster or enhanced growth/color, but some excellent marketing using real scientific data, but stretching, bending, and making conclusions/claims/ hypothesis to sell a product. A page right out of pharmaceutical companies playbook!
The immediate PE extension may very well be the coral sensing the aminos. This however does not prove or demonstrate a deficiency, rather a feeding response. It seems likely for all tanks there is no AA deficiency and no proof of faster or enhanced growth/color, but some excellent marketing using real scientific data, but stretching, bending, and making conclusions/claims/ hypothesis to sell a product. A page right out of pharmaceutical companies playbook!



Lets not detract from the subject of AA's, their utility, and the conclusion of the advanced aquarist article. My apologies for letting my personal feelings and bias creep into a great discussion!!! 



