Dose anyone use NH4NO3 in place of KNO3? I am about to order some fertz and was thinking about trying NH4NO3 but really don't know much about it use for planted tanks. Are there any possible issues with fish, shrimp? Does it work as well?
You CANNOT use Ammonium Nitrate (NH4NO3) instead of potassium nitrate for a few reasons:
Firstly, ammonium nitrate contains ammonia, which is detrimental to fish health. When you dose ammonium nitrate you're adding ammonia as well as nitrate to the tank. I use ammonium nitrate to cycle my tanks.
Second, potassium nitrate has potassium in it (K) that's why we dose it into the planted tank, it contains potassium as well as nitrogen (in the form of nitrate). If you go by the Estimative Index then you'd also dose Monopotassium Phosphate (KH2PO4).
I personally dose Potassium Nitrate (KNO3), Potassium Sulfate (KSO4) and Monopotassium Phosphate (KH2PO4). But I use chemistry calculations to create solutions so that when I dose these solutions I know exactly how much of each element I'm adding to my tank (kind of like any liquid fertilizer you'd buy).
I'd suggest using the EI dosing method. There's an online calculator called rotala butterfly if I recall correctly. It can help you with that. I use it to make sure my calculations are correct.
Keep in mind this only covers the macro nutrients and not micro.