Without a water test, I'm guessing the problem was pure old chloramine.
Nothos are, IME, a whole lot more sensitive to chloramine/chlorine than any other kind of killies. Well below 1 ppm will usually kill Nothos, while Bit and BIV may just laugh at those levels. It is quick, too -- often in only a few minutes.
TEST! Any visible trace of color, when the test vial is held up against a white refrigerator o/e, will be enough chlorine or chloramine to severely damage gills and skin, allowing other diseases to develop later. The real villain is never suspected in those cases. Only Nothos have had the good grace to die immediately, for me. Most other fish were just sterilized and/or eventually weakened and died.
Wright
PS. Aging and aerating will do no good. SG, like most developed places is adding ammonia to make chlorine into chloramine to protect you from cancer. Only really backward, rustic places like Bishop CA still just add straight chlorine without the ammonia.
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Bishop, CA 93514 USA
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