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I've cut the vinegar dosing back to what I was dosing before the issue because everything was getting goopy and cloudy with no results. Runs about 10ml per day.And how much vinegar are you dosing per day?

Personally, I think you are probably doing more harm than good messing with the rock and sand. I may have missed it but have you bought a new/different brand nitrate test kit to confirm your results?
When you first started this post it appeared that you had no other issues other than high nitrate numbers. If that is the case then those other issues are surely attributable to the recent changes you have made.
Are those new test kits the same or different brand as the one you were previously testing with? Are you using any media in the tank right now? Any pics of the tank? I'm trying to get a full picture of what the issue is. There really is an issue as based on what you are saying, I see no reason for you to have such a drastic increase in nitrate in only a weeks time.

