Same on the salt as a no.
Guess I'll muddy the waters somewhat
CB makes a really good point on the initial half dose on meds if you go down that road.
The heat treatment is also successful.
Personally in an expensive planted tank and caught straight away, I'd try heat. Bad case or in the middle of winter or just had a bacterial infection, would go meds (right after I changed shops if that's twice from one shop).