- Joined
- Oct 8, 2019
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- 171
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- 172
What are some things that would cause a tank to have zero nitrates? My phosphates hover around .03 but my nitrates are at zero. I do have a lot of rocks and also rocks in my sump with marine pure blocks. Could that be the cause? I hold off on weekly water changes to see if it will go up but it stays at 0. Any ideas?