I can't seem to keep my nitrates down. Need help please
Ok, so like the title says I need some help an guidance. I have a 90g tank that's been up an running for over 2 years and I always seem to be battling high nitrates. I'm at 80-90ppm. I do EI dosing an I've stopped dosing no3, I do weekly WC's of 50-60% The water that I'm adding it tap and the no3 is about 1-2ppm. I'm adding co2 at more then a 1 ph drop and I'm pretty sure I have plenty of flow seeing that i use an fx5 filter plus 2 hydor pumps.
What am I missing or doing wrong ?