KNO3, KH2PO4, KSO4, and GH Booster (you'll definitely use the first two and will probably pick between the last two) are all cheap. When you figure out the exact ratios you want, you can mix them accordingly and create your own mega macro.
A forum community dedicated to Aquatic tank owners and enthusiasts. Come join the discussion about flora, fauna, health, housing, filters, care, classifieds, and more!