You know I forgot to mention this a while back but I read on WetWebMedia (which is a pretty good site for expert advice btw) that the BioWheels on Marineland filters can turn into serious nitrate factories, over time. Your set up has been running for what? 8 years? If you are still having high nitrates have you considered removing the wheel and seeing if that helps (like remove it and test the water 1 week later)?





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