U should relly look into it, its better and cheaper.
And Jorg(founder of Sangokai) writes whats inside the botles, so no "snakeoil" - so in my system Im actually adding a lot of N and P, besides aminos etc - and I dropped the true ULNS method, because of lack of color and health on my sps.
This way is good, and even cheaper. I dont use all his "stuff" as zeolith stones and carbon, beacuse Im a beleiver in heavy skimming, and waterchanges - and a lot of feeding to make fish and corals healthy.
I have great succes with No3 as high as 5-10, and very low inorganic P, but I do dose organic P and iodine and Kalium (Potassium) to the system though.
His website sangokai.de is mostly in German - but use google translate. His ingrediens are much more potent - and furthermore, i prefer I know what Im dosing to my system
Just trying to help, its your tank, and yr decission
Peder