Problem with vodka dosing is that it requires more po4 than no3 to work, and if you don't have enough of one or the other available then the process stops and you are just getting the fish drunk.
Fish are very tolerant to no3, 100 ppm doesn't hurt them.
You should be able to bring down your no3 with water changes, if notthen I would suspect your WC as a source of no3 and test it before and after you mix the salt.
That foam in that skimmer is to prevent the bubbles from getting out.
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