In my experience at least, salt melts most plants.
on some websites you can find lists of supposedly 'salt tolerant' plants that include everything from hyrophilia to anacharis to amazons.
and in nature, its true that some grow close to the ocean in rivers in south america.
however, I have never heard of many of these same plants doing well at normal salt dosages for ich treatments.
everytime someone says I added salt..at least some of their plants melt.