Salt In The Tank?, is using salt good for our goldfish? Options

[kinggold]

I have read on many forms the debat of adding salt to the aquarium.
I am currently not using any salt in my goldfish tank.

I know there are some benefits in having salt in our aquariums, but should we always keep salt in it?.. or should we rotate.
I know the rule of thumb is to add one tbs of salt per gallon.

What do you think....?