I'm setting up a 20 Long planted tank and although I'm experienced with fish I have almost none with plants. The substrate is pure sand so I know I'll need to dose ferts. I have a 30" Nat. Geo LED light so it should be low light. I plan on having a carpet of dwarf sag and I'll be trimming it to keep it short. I also plan on having driftwood with needle leaf java fern growing out of it. What I've read has told me that I need to dose Seachem Equilibrium, Potassium Nitrate, and Potassium Mono Phosphate every week or two. Is this all I will need to dose? How much of these would I have to dose and how often should I? Does everything else sound good?