If you want to do the salt bath then by all means do so. It is a personal dislike of mine to add anything to a tank if you don't have to. Besides which, on the rare occasions I have tried the salt treatment the fish promptly died so perhaps I am biased. 50% changes a day would be good and I would not add anything else to the water, but that is just me. Go with the majority :lol:
If the fungus worsens, or does not improve (it may end up like scab in that the fungus remains until you wipe, or knock, it off but the wound underneath has healed well) then use an anti-fungal treatment.