I thought from the water resources we site someone quoted earlier in another
thread, there is less sodium in softened water than in the average glass of
milk.
Why a problem?

wrote in message
...
I used softened water for my GF for years with no problem. I added some
organic
dolomitic limestone to the water. I drank softened water for years. I
have low
blood pressure. Ingrid

I think that using Softened water for any kind of fish is not a great
idea.
Its very much too soft & depleted & then again much too full of Sodium
ions
to be good for them (which is why we humans shouldn't drink it either!).