Salt baths are fine and effective if done right. You will also need to treat that tank or you will be putting the back in the fire. Once you do a salt bath they will have no slime coat. They will look horrible. It will take a few days to look good again. Most people hate Melafix but if you can get it I use it after a salt bath. I prefer 4 minute salt baths w/ 4 teaspoons per gallon. Some people go longer with less salt. Your call. Once they hit the water chase them with your hand to make them swim to clean out their gills. PH is IMPORTANT !!! I tank 2-3 gallons on tank H2O they are already in, put it in a bucket, mix the salt, and the races begin. You must treat the tank with one of MANY products. Quick cure is harder to find now then it used to be.