The article I posted was a general article on salt that I wrote a couple years ago, not written specifically to answer your question on discus. The article simply states the scientific data on what salt does to fish. I am not going to argue this, it is comparable to arguing that the earth is spherical with someone who believes it is flat. The scientific evidence is there, whether anyone believes it or not, it is still fact.
Talldutchie, you are referring to basic mineral salts in post #12 and there is no argument on that. The initial "salt" mentioned was common sodium salt being added to a freshwater fish tank with soft water fish, and as we all realize this is not wise. Enough said.
Byron Hosking, BMus, MA
Vancouver, BC, Canada
Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]