NA Macro & Micro Liquid Aquarium Plant Fertilizer

Why do you need NPK liquid fertilizer For a 20-gallon NPK liquid fertilizer, higher light tank dosing would be as follows: 2 pumps of the micros per day Monday, Wednesday, and Friday 2 pumps of the macros per day Tuesday, Thursday, and Saturday 50% weekly water change is suggested on the 7th day per EI guidelines followed by the addition of the GH booster of your choice Who needs GH booster:  The addition of GH booster to NPK aquarium fertilizer is necessary if you do not have very hard water. Adding some GH booster is also suggested if you have hard water but do not know the concentration of both calcium and magnesium. Why is GH booster suggested when using liquid NPK:  GH booster will add magnesium and calcium as well as add extra potassium, which is all very important to plant growth. Do I need to add extra iron to liquid NPK fertilizer products? For most tanks, the iron that is already included in the Liquid M will be enough.  Some high light, high co2 tanks however will require