Buy:
Potassium nitrate (KNO3) which provides potassium and nitrogen
Potassium phosphate (KH2PO4) which provides potassium and phosphorous
Then go out and buy Seachem Equilibrium and dose enough to raise your water by 1/2 or 1 dgH to provide for calcium and magnesium and a healthy dose of other traces. Also buy a trace mix like Mallick's Lushgro Micros or Seachem's Plant Nutrition (formerly Tropica Master Grow), or Ferka's Aquatilizer.
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