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The fish in post #15 will be fine in your well water "as is," meaning not having run through the softener.
Great! What would be the best way to switch to the new water? Should I just mix a little into the old water after each water change, and then gradually increase the amount of the new water going into the tank?
If this were me, I would do weekly water changes of 30-35% with pure tap water (pre-softener) and let it work itself out.