I think we just established the presence of nitrates, lol. Since the tank is currently empty, I’d just skim. Once the water clears up, you can dose a little bit nitrates (seachem nitrogen is one option) to raise the tank to 5ppm. This will probably cause the water to cloud again and nitrates will likely bottom out. Repeat this cycle and continue skimming until the water remains clear and your nitrates stay at 5ppm. This will indicate all of the vinegar was used up. Your tank will then be ready for fish and you’ll have a much more “seasoned” tank that’ll be les likely to develop dinos or cyano as long as you keep nitrates at 5-15ppm and phosphates at .03-.1ppm.