My 60g fish-only is stuck on a high nitrite peak, nitrites have been testing high for over two weeks now. I have a Aquatech 300 GPH HOB filter and Aquamaxx HF-M HOB filter/skimmer running on the tank. The cycle was started using Fritz Aquatics Turbo Start three days prior to adding two fish. I contacted Fritz Aquatics customer support and they suggested that a low phosphate level could be causing the cycle delay. The phosphate level is like .25, and they said it should be sufficient. Nitrate is at about 50, so therefore I know the Nitrobacter is hard at work. The tank has been set up for approximately 8 weeks now, and the fish in it are doing fine, flourishing..... Did three 25% water changes over the weekend and did not see any decrease in the nitrite.