I've been vodka dosing manually for the past two years. Once your nitrates come down, you can start to decrease the amount of vodka you are dosing. Ideally, you want to use as little as possible and not be overdosing (lest your SPS will start to get bitchy).
The problem with vodka dosing (or any carbon dosing method) is that you are creating a bacterial bloom, which can wreak havoc in your tank if things go bad (ie. deplete oxygen). If you dose a bunch of carbon at once you run a higher chance of a big bloom, so ideally breaking it up into a continuous drip or several smaller doses will negate this. That said, unless you have a fancy-shmancy doser, several doses a day is a real PITA.
I used to do 2 or 3 a day at when I first started (when I was up over 2ml/day in a 50 gallon tank,60 gal total) but after decreasing to about 0.8ml/day I just dose it all at once in the morning without issues. For a while I was doing 1.5ml/day all at once without issue, so I think at 2ml/day for you you can still do 1 dose because of your tank volume. If you get up to 3ml/day I'd start breaking it up. You'll start to get a feel for how your tank is reacting to dosing and you can adjust accordingly.
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