I have a water softener system in my house(sodium based), how will this effect my fish? I read some where a while ago that I would have to use a potassium based softener instead of a sodium based, does anyone know if this is right? If I can not obtain a potasium based treatment what can I do about the amount of salt my system adds to the water? I also have a Goldfish tank (only 1 Fish), what problems would the softening system cause in this tank?