I edited a bit hun so go back and read
Not a full water change. Salt raises pH and hardness, so you don't want to slingshot him back and forth. Add a half dose today and do a 20-50% pwc tomorrow and each day after. You can replace the salt comprable to the amount you take out in your pwc for up to 10 days if you like, but I don't think he would need that many treatments as he already looks healed.
What is tank temp btw?
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