I know someone who tried the vodka and was having good luck with it. Then out of the blue, he had some crazy bacterial issue happen and lost half of the corals in his 180. Myself...I would try to cut back on feeding, up the water changes for a month or 2 and give it some time and see what happens. I assume your tank has been at 40 for a while. Things havent died but are unhappy right? If this is the case I would do a larger than normal water change before you go and tackle the problem when you return.
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