Favorite sources of Macronutrients
Edit: I realized there was a fertilizer/nutrients forum after I posted this here. I apologize for any inconvenience I tried to delet this here but couldnít get that accomplished.
Besides the flourish line of products what are your favorite sources of macronutrients? Iím interested in learning about any proven and hopefully more commonly available and/or more cost effective sources for nitrate, phosphate, and potassium for dosing the water column.