I think everyone is right...how about that?
I think most of the usage of amino acids is based on very little knowledge and mostly pure hype and the empty concept of "pop".
If "pop" is anything, it is the word we give to the gap between how corals actually look in reality and how any given reefer thinks they should look. Not useful. Certainly not measurable.
Further, as we've said, there's no way to measure AA's present in the water. (Not at home anyway.) So it's very hard or maybe impossible for us to say what's going on directly.
On the positive side, I haven't see a problem from AA dosing that wasn't clearly related to over-dosing/not starting small and observing the system.
From what I've read so far, it's extremely likely that AA's can be of some benefit to the system as a whole....from the phyto up to the corals.
Speaking Only For What I Do
This makes them worthy IMO of dosing at a very small rate like I do....about 5mL per week per 100 gallons....dripped daily.
That's not enough to register on a nitrate test kit even though it's being dosed with 10mL per day per 100 gallons of KNO3 solution.
Yet I'm still seeing fairly dramatic changes in the tank, even at zero levels in the water.
For example, I recently tapped out the tank's PO4 supply. It registered zero on my last test, so I'm going to feed a little more R.O.E. and NLS flakes. Pest algae has completely changed complexion and coraline is showing up in more places.
So I plan to keep dosing the combo of KNO3 and AA's in about the proportion that I am....but I have no intention of increasing the dose of AA's anytime soon....and I also plan to keep reading.
The only advice I give if someone wants to dose amino's is to start small and take it slow. I don't think I would recommend it for the purposes of raising Nitrate levels though. KNO3 is a better choice. (I'm not convinced AA's break down to nitrates with any directness, if so that would add to the tendency to overdose.)