Live plants - If you live plants in your aquarium, avoid using salt. Plants can be damaged with a relatively low dosage of salt, which is one reason it's best to treat sick fish in a hospital tank rather than your regular tank.
i was curious my self so i googled it. Above is what i found on a few different sites. The internet isnt allways right lol. Im sure these guys will chime in but doesnt look like a good idea good luck