My nitrate is currently 4 ppm. Would like to bring this to 0.5. po4 is 0.02. I do not have a lot of fish and feed 1 block of fresh mysis every day, which I certainly do not like much I now use 400ml instead of 200ml zeomix for the last 2 weeks. And 2 weekly I replace phosphate minus with 150 grams. Also use life bio fill (250ml) Every day I add 4 drops of pro bio s and np pro. How can I best reduce the no3 content?