That wasn't good lfs advice-- Clout for Ich. Clout is much more toxic, including an insecticide trichlorfon. It's used for more resistant multicellular animals, especially the parasitic flatworms we call flukes. The Shedd Aquarium in Chicago passes their new freshwater arrivals through a short bath-- ten minutes only-- that builds up to full-strength seawater, in order to make flukes drop away. (It doesn't actually kill them.) I've never tried such a concentrated salt bath.
One-celled ciliates have fewer defenses: just one cell wall between them and the brine.
RTR's right as ever-- fishes do vary in their sensitivity to salt. At the first sign of heavy breathing or other stress, you should be ready to do a 50% water change, whether it's salt you're using or formalin/malachite green.
One thing about Ich: you can see when you've been successful.
One-celled ciliates have fewer defenses: just one cell wall between them and the brine.
RTR's right as ever-- fishes do vary in their sensitivity to salt. At the first sign of heavy breathing or other stress, you should be ready to do a 50% water change, whether it's salt you're using or formalin/malachite green.
One thing about Ich: you can see when you've been successful.