I have it in ffof with added perlite and dolomite lime, I had been watering with a little bit of calmag (I use RoDI water), until last watering where I added 2 teaspoons of growbig per gallon. I had bought a decent ph meter but it never worked and I havent gotten around to getting a new one so for now i cant really test the water I'm feeding with.Potassium. What medium? What are you feeding it? pH and EC of nutrient feed?