In general it won't affect your aquarium at all. I have one in my house and it softens everything except the outside water lines. While I know the common interpretation is that it isn't 'good' to drink softened water that generally isn't true. The vast majority of softened water is less than 200 ppm of NaCl which is not really noticeable to anyone. Granted, it does depend on how 'soft' you are making the water.
My RODI strips it all out anyway when I am making water for my saltwater aquarium. I use softened water in my fresh water aquarium as well and there are no ill affects there either.
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130 Gal Community Planted Tank and a 250Gal Peninsula FOWLR
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