Good stuff. It does what your dealer says, provided your tank is in otherwise good health. Adding regular Aragamilk doses makes my coralline grow like a weed, and dramatically helps with PH
Some notes on Aragamilk:
First, most bottles of this stuff have severaly precipitated out causing a lump to form at the bottom. I suggest any new bottle, or even one in frequent use, to be shaken 'violently' for several minutes, and be pounded on the floor to break up the sediment. Aragamilk should have the consistency of a malted milk shake, not skimmed milk.
I use half a cap per day on my 55 (about 1tsp), but I'm only just beginning with some hard corals. I strongly recommend using smaller doses more frequently vs large doses less frequently, which is a common mistake with it. This will prevent PH
hops and spikes.