If the tank's pH is fine as is, I'd probably add the vinegar (3 tsp per gallon) and see how that goes, and work from there. My tanks run at a fine pH with that lime:vinegar ratio.
You can go up to about 2 level teaspoons max if you need to. Gauge the need by alkalinity, making sure the pH does not get too high (not above pH 8.5, if possible).
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