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Yes it's possible for your tap water to have nitrite reading at that level...it's also possible that it's within the error ratio of the test kit...After reading your posts, I don't think this has anyhting to do with water quality and everything to do with a parasite problem.
While it would be nice to see that ammonia at 0.0ppm; at a pH of 7.5 it isn't a great concern and wouldn't be causing the problems you're seeing
The 0.3 of NO2 is nothing and the salt will protect the fish that small amount forever.
The 10ppm of NO3 is nothing, everyone wishes they had it that low.
Not sure what you're seeing on the tail but it isn't flukes as has been mentioned. The symptoms that you're describing definatly sound like a gill parasite problem and dead gills tell no story so try and get a scrape/sco[pe of a live fish...
G
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