Take it for what it's worth......
I used vodka my 1st year of reefing with the promise of overstocking and overfeeding with lowered nitrate and phosphate readings. The results - started with 15 fish and a handful of corals (sea fans, softies, and LPS), Nitrates were very high 80 ppm, P04 5.0+ within' 4 weeks nitrates were within 20ppm, 8 weeks Nitrate 20ppm po4 .05, 12 weeks Nitrate below 10 ppm Po4 .05 - that's when things went south.......
I started noticing brown bacteria growing all over the rocks, coraline algae started dying, corals started dying, red slime algae was all over under the sand bed. after 16 weeks with Nitrate below 10 and po4 .05 - marine ICK on 90% of my stock, coraline completely gone, Red Slime was now my chief de-nitrifying bacteria, nitrates and phosphates pretty much disappeared but so did my fish and corals - the tank was Nuked. 50% of my livestock died leaving me with a tank full of ammonia and nitrite - The tank went full circle from early maturity back to the beginning.
What went wrong? Simple answer, organic carbon dosing works for mature stable low nutrient tanks. Adding 15 fish isn't low nutrient, feeding new growing corals daily isn't LNS either. Adding to the cuc, adding fish, adding corals, adding inverts, adding anemones, etc... increases the bioload. The higher the bioload the more Vodka to lower Nitrate and po4 eventually leading to overdose. Had my stock been set and appropriate for a LNS corals and inverts established things might have been different but new systems are exactly that, new systems with (in my case) a high level of TDS.
After the holocaust I went a different route, GFO and 6 units Chempure elite. It took quite a few GFO changes to remove the Po4, tested every 4 days when po4 came back and it does, I swapped out the GFO til' it was completely gone. The Chempure soaked up the Nitrate really quickly and should be good for like 6 mo. Purgien is another tried and true route. I also run a carbon reactor- it helped clear up alot of the dead bacteria build up on the rocks which is still present several months later. I do have coraline again with no additives, Ick is gone, corals were replaced and growing health for the most part. Red slime's gonna be a bugger to get out but it is slowly dissappearing.
Just wanted to give you another persons experience with Vodka, and not the upbeat magic cure all some of the websites will lead you to believe.