Amino's only really help people with ULNS (Ultra Low Nutrient Systems). The Amino Acids are the bare bone proteins necessary for corals to have nutrients to thrive on. If you have nutrients, Amino Acids won't do much if anything.
If your system is running an at no3 & po4 of around, 0/0 to 0.5/.01 you should notice some difference. If however, you are running no3 of 5+ and a po4 of .03+, you shouldn't really notice much of anything.
To put it simply -- Amino Acids are the building blocks of protein (biology stuff here), introducing Amino Acids is basically introducing trace amounts of nitrates to your system. I prefer to keep my no3 at a minimum of 5, upwards of 10.
Lastly -- Amino Power is extremely diluted. You ever pick up a bottle of something and it says to use one or two drops her 25g? Well, AP says to use quite a bit. I forget the actual number, but that means it's got a LOT of water content. If you fit the description of someone needing Amino Acids (ULNS system), I would advise looking into ME Corals, or maybe KZ Aminos. They're significantly more concentrated. But as with all concentrated items, make sure not to dose beyond it's recommendation unless you are extremely familiar with the product.