Potassium nitrate with a stocked tank
I'm starting to see some deficiency in my staurogyne repens but not sure if it's nitrate deficiency, but I don't dose nitrates because I believe I have a good source of nitrates from my fish stock.
I test with api so I might be getting false readings, should I dose potassium nitrate anyway just incase my test kit is incorrect?
The deficiency looks like the leaves on one of my staurgyne is melting and turning brown from the tip toward the base. Not sure how to post pics on here.