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Old 12/25/2017, 11:56 AM   #2
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,608
Okay, let's go through the basic steps. I'd check the nitrite level, because nitrite will confuse nitrate test kits. That's a low probability event, though.

I'd guess that you might want to increase the NOPOX dose. It's basically a mix of vodka and vinegar, and that dose might not be enough. I suspect that cutting back on feeding will help a lot. There's no need to worry about the Redfield Ratio in this context, since you're not feeding phytoplankton, and denitrification can occur without net phosphorus uptake.

Jonathan Bertoni
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