Although salt can be beneficial to some hard water species like guppies, mollies and rainbow fish, it is bad and even toxic to others like dwarf cichlids, gouramis and catfish.
It is also not good for plants either.
Keeping high quality water by doing water changes is probably a better way to keep your fish healthy.
I don't feel the need to use it myself.
Salt is suggested by many as a cure all for desease.
Becarefull what you do with it!
See the october issue of Aquarium Fish Magazine for more about salt.
Larry.
http://www.users.uswest.net/~laren
