Ok, so I've been dosing EI since right at christmas time. Got my co2 levels where they should be now in the 20-30 ppm range. I have to say i'm amazed by the plant growth!

I just have a few questions.

My phosphates are still testing at over 10ppm. I've been fighting green water constantly. Which i just got on top of with a uv sterilizer(wow do they ever work!) just installed last friday.

Could this be attributed to the high phosphates?


I also have noticed what seems to me a potassium deficiency. My rotala roundfolia and moneywort, on old growth, starts with a small yellowish spot which turns into a pinhole and then grows larger. So I ran across a fertilizer calculator Calculating dosages of fertilizer elements for a planted tank. When I put in my variables 1/4 teaspoon Potassium Nitrate and 1/16 teaspoon potassium sulfate i come up with somewhere in the range of 8ppm of potassium.

This seems low to me??