My phosphates and Nitrates have been high, Nitrates running 41, Phosphates 0.190. I have a GHA breakout and now Cyano. I did a 2 gallon water change. Readings Nitrates 33.8 and Phosphates 0.150. I added 1ml of Red Sea NO3: PO4 X yesterday, today I tested and my Nitrates are 21.2 and Phosphates 0. Is the Nitrate reading acceptable? I don't plan on dosing again due to the Phosphate level. Any advice? I have a 16 gallon Bio Cube, 2 clown fish, 1 Blennie, 1 Fire Shrimp and a clean up crew.