If you set up the tank as a "natural planted tank" per the Diana Walstad method, you won't be dosing any seachem products, other than perhaps Prime to neutralize chlorine and chlomamine, and Equilibrium, to increase the GH a bit. If you just use low light, you can use less fertile substrates, and dose Seachem Flourish Comprehensive, for trace elements, Seachem Flourish Nitrogen, for nitrogen (nitrates), S.F. Potassium, for potassium, and S.F. Phosphorous, for phosphorous (phosphate). But how much you would dose depends on how much light you use.