i found this online im not sure how accurate it is
What Is an Acceptable Level?
The optimal amount of nitrate in any type of saltwater system is an immeasurable one, but an acceptable range for fish-only tanks is from 10 to 40 ppm. Although fish-only tanks may run at much higher levels, sometimes with no ill effects, this is not recommended. In reef systems even a minor level of nitrate can cause damage as well as death to delicate corals, anemones and other invertebrates, as well as some crustaceans. The acceptable range of nitrate for reef tanks is 0.25 ppm, but not more than 5 ppm.
they also suggest that you do a 20% water change then another 20% change a day or two later
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