I came across an interesing write up on Zeovit, which is *suggested* as being better for a tank than Vodak dosing. I am no expert in this subject and am providing the link simply for possibly bringing to light an option. I know some here swear by vodka doosing, and others have seemed to have no results from it. So for your reading pleasure:
http://www.korallen-zucht.de/files/zeoguide_english_1_03.pdf
Andy
http://www.korallen-zucht.de/files/zeoguide_english_1_03.pdf
Andy

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