Listen to this: (from "The Simple Guide to Freshwater Aquariums" by David E. Boruchowitz) " [...] Salt is a wonderful treatment for wounds, infections, and parasites. It stimulates the fish's production of natural protective slime, and it deters or kills many disease organisms. This doesn't mean you should start adding salt to your tank whenever your fish don't look right! If they have cottony white growths on them or open, gaping wounds, or creatures hanging from them, sucking their lifeblood, salt is a good remedy. The best way to administer salt is to use a salt bath or dip. To do this, take a couple od cups of the aquarium water in a small container and add half a teaspoon to one teaspoon of salt. Mix it well, then net the afflicted fish and lower it, still in the net, into the salt bath. If the fish shows signs of distress (thrashing about), remove it immediately and dilute the bath with additional water from the tank before trying again. You can leave the fish in the bath for up to two minutes, provided it does not show signs of dostress. The dip can be repeated one to three times a day until the problem clears up. The salt can also be added to the tank in greatly reduced concentrations, but that is not the preferred method of treatment. [...] " So, I am wondering, if dipping a fish in water with a highly concentrated salt is really safe for fish? Wouldn't it burn the fish's gills and eyes? Isn't it necessary to add (even a little amount of) salt to a tank very gradually? I have always thought it's best to add salt gradually to a tank and that a lot of salt can burn the fish's gills, etc ... and this new information has confused me greatly.