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@rgomoll Roger, I would advise the 5 gal. at a time method, since they’re all a little different, at least the Meyers ships. I got a 12” length of 1/2” balsa wood, added a firmly attached lanyard, and with a Sharpee labeled one face “M” (main) and the opposite face “A” (aux). Then I did the 5 gal. at a time separately fot the mains and the auxes — they’re not the same — and used the Sharpee to mark the stick. When you dip the marked balsa stick, it gets wet up to the mark, but by the time you do the next tank, it has evaporated enough so that there is no risk of confusion.