I see a lot of people using salt in freshwater aquariums. I don't use it. I've got hard, high pH water and I just don't adding salt is a good idea, so I don't. But, I know many of you do and it seems to help fish in general and may prevent some diseases. I've gotten rid of my corys (returned to pet store) and I've got loaches, rams, and dwarf gouramis, and of course my black ruby barbs. Any comments on salt will be appreciated.