what about the absence odor from the plants? that seems like a much more serious problem.he has flushed them with regular water and i mean lots of regular water.O THE PLANTS do not have extreme salt biuldup,the leaves are not curling under only some of the tips are yellowish some brownish.

i got some more info,some of the stems have reddish streaks on them,many of the leaf stems have reddish to purple leaf stm color.
im not a expert at growing plants myself ,but i know from raising other plants that those colors are deficeincies.

he seems to be fixated on the absence of odor,like you said the sweet flowering smell is non-existant ,i beleive its driving him mad,the mystery at least to him.