If there are no corals suffering, I wouldn't worry too much about the nitrate levels being at that level. Fish are not nearly as sensitive to 20ppm nitrates as say sps or some lps corals.
Is your tank mainly fish or is it a mixed reef setup?
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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