by Naja and Arnaud Girard In early December when water testing in Key West harbor showed off-the-chart numbers for fecal contaminants, the city rounded up the usual suspects:  the boaters.  Them again!  Certainly they were polluting the harbor by not using mandatory holding tanks and new regulations for offshore liveaboards were swiftly introduced.  But the data collected by The Blue Paper tells a very different story. Between November 19 and December 3, the city conducted two weeks of testing in eleven…