Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I use the underlined products in all the tanks.
I use GH booster only in tanks with hardwater fish.
KNO3 provides N and K, if you use it according to the EI recipe, or close to it.
If the NO3 in your tank is already up there, you might not want to add quite so much KNO3.
K2SO4 is a good way to dose the K that plants need, in case you will be dosing less KNO3.
KH2PO4 is a source of phosphorus. Yes, it has K, but it is dosed at such a low level that the K almost does not count.
CSM+B is trace minerals. Some people find it is a little low in iron, so also dose chelated iron.
GH booster contains Ca and Mg, and some contain K. (Seachem equilibrium and Barr's GH booster are very similar)
There should be no need to dose acid and alkaline buffers in an aquarium if the GH, KH, TDS are maintained in the right range for the fish. This is the goal with a blend of RO + tap, or pure RO with KH and GH minerals added.
However, read the labels and make sure you know the ingredients. One form of this type of product (ph altering salts) is so high in phosphorus you would not need to add any more.