I'm dosing vodka right now on a 29 gallon tank (I'm not in permanent accomodations right now so that's the best I can do!), but I've also previously dosed it on a 90 gallon, a 125 gallon, and a nano (can't remember the volume). Right now I'm using 1 ml a day in the 29 gallon. NO3 0 and PO4 0. No bacterial blooms, no tank crashes, excellent PE, good growth. Right now my 29 gallon is dominated by SPS, but the previous tanks were mixtures of SPS, LPS and softies. No problems either way. Oh, and those puffy things you're seeing are likely q-tip sponges, you'll see a lot more filter-feeder type things in your tank growing out of the live rock when you dose a carbon source, in my experience. I have nothing but good things to say about carbon dosing. I've also used zeo in the past with similar results. It's a good product as well.
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