You can do up to 0.3% for short periods. Generally to cure ich, 0.1-0.2% and raise temp to 86 should do the trick. With salt it doesn't evaporate, so water changes are the usual method to dilute it down.
You can do up to 0.3% for short periods. Generally to cure ich, 0.1-0.2% and raise temp to 86 should do the trick. With salt it doesn't evaporate, so water changes are the usual method to dilute it down.