Welcome to Canreef.
Define out of this world with regard to your nitrate reading plse. Additional water changes are likely the best option and perhaps confirm the validity/accuracy of your test kit. Other than that, how's your livestock looking? If everything is still looking fairly healthy, don't sweat it too much and as mentioned, prepare for another water change or two.
Tell us a little more about your set up and some more experienced members will be able to offer more expert advice. Good luck and hope everything turns out ok.
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