K2SO4 instead of KNO3?
I'm doing EI and I have really big biomass (I have 10 sub adults altums) in my 142g.
I'm checking NO3 twice a week-
Day after water change and day before the big weekly water change and I have always 30-40ppm NO3.
I don't add any nitrogen and I have 0ppm in the tap water.
To use only K2SO4 instead KNO3? Any problem? Same quantity like I supposed to add the KNO3?
KH2PO4 I'm using normally.