You can dose the vodka at one time/bolus dose it. The ethanol does not cause a short term precipitous drop in pH like acetic acid in vinegar does which is one of the reasons I prefer vodka for the most part.
If you go with 3 for me one for tank; all of your tanks will probably look better to you.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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