Im no pro with ferts but I also just set up a tank with sts and know how gentle you need to be with this stuff. But im so pleased that about 6 bucks worth filled my 40g with probably too much. What I did was after I rinsed it about 15 times, I let it dry a little, added some borneowild bacter crystal and boost on top of a small layer of sts. I mixed a couple gallons of fertilized water and poured it into the tank after filling it with the sts. Hoping to "mineralize" the dry sts with ferted water. In my head it seems like a good idea.