Have you tried adding Interpets liquisil, its a general tonic and can be used once a month as a preventative measure, I use to use both 'Tonic and salt' then when I started using aquasafe and easybalance I asked Tetra if I could still use salt and the reply was what I told you you before 'only if they are ill'
Ps Have you see my forum : Did you know: it will explaine why goldfish always look hungry
Ps Have you see my forum : Did you know: it will explaine why goldfish always look hungry