Planted Tank Guru
Join Date: Sep 2004
Location: Garden City, KS
I don't think you'll need the gh booster if your water is hard already. I'd skip that. Then, the only other thing you don't have listed is K2SO4 (Potassium sulfate). I'm not saying you'll necessarily need that, as many other people don't dose it, but if you ever stop dosing nitrates, say, due to a large bioload that you eventually have in the tank, there won't be a whole lot of K in your fert regimen.
Other than that, you should be set. As far as mixing the ferts in water, I don't do that personally. I just dry dose. But if I were to mix up a solution, I would use distilled water, because tank water would contain little critters that might cause the solution to spoil faster. I really don't know if this is the case, though.
Hope that helps.