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Alk 300? Do you mean calcium 300? Is it a fish only tank? Nitrates at 80 is high even for a fish only. Especially if you just did a water change. What is your SG at? I thought that is what you meant was to high.
I'd continue to do at least weekly water changes and probably twice a week till I got the nitrates down. It seems as if we aren't talking about the same thing here.
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