You could always dose with vinegar and save the vodka for yourself? I believe that you multiply the amount of vodka you dose by 8 and that is the amount of vinegar (5%) you would dose to get the same amount of carbon.
Cheers! Mark
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2x 65g displays with a 30g cryptic refugium and 30g sump - 55g reef
30g Bio-cube reef - I.M. 30g reef - 45g freshwater
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