My tank has been doomed with high nitrates since the beginning. I hooked up a sulfur denitrator recently and now my levels are 3ppm nitrates. My Xenia are not looking so hot but everything else seems happy. My question is this, if natural levels are 1ppm why would any coral suffer from low levels. I have a mixed reef and just curious if any others will start to suffer. My PO4 is 0.08 also.
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