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HI everyone! Wasn't sure where to post this. I'm not a total newbie but new to having these problems. We have a 125 gallon tank with nitrate and nitrite problems. We've had various filters over the years. We have tried everything suggested to us to get numbers down. We were successful is getting nitrites to almost zero but nitrates still pretty high. We just bought a Fluval FX4 and it's been running for a 7 days. Now the nitrites are off the chart (where they were almost zero) and nitrates worse. Surely this can't be normal?? My heart sank when I saw the reading.