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A shot glass is about 1.25 to 1.5 oz (37- 44cc/ml).
FWIW, I've been dosing 60 ml of vinegar and 36 ml of vinegar a day( a total vinegar equivalent in terms of organic C of .497 ml per gallon) for many years as a maintenancece dose; I'd start with 25% of that and amp up over a month or so.
PO4 holds in the .02 to .04 range with NO3 under 1ppm withouyt GFo; i do run a small amount of rox activated carbon and two large skimmers to aid organics removal.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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