Water softeners usually substitute salt for other ions in the water, which is generally an improvement for reefs. There can be contaminants that aren't removed, though, so lots of people (including me) use RO-DI water. This article might help:
If I were using tap water, would I soften it first? I'm not sure. It probably removes some impurities and adds others. I'm not sure which is best. The answer probably depends on the purity of the salt used.
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