Nitrates question please

singold

New member
Is 10-20 ppm Nitrates tolerable for corals and fish pretty much. What is considered a danger level so to speak with Nitrate levels when dealing with corals and fish?
 
Fish have a ridiculously high nitrate tolerance. That said, they're still stressful... But I would begin to worry about my nitrates with corals over 25. They're much more stressed by nitrates.
 
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