Yeah, when I was first adding the salt it was very slowly precisely because I was concerning about the copper medicine still being in the tank and not yet completely filtered by the AC. I really doubt that was the problem, other than just adding the salt at all into an already stressed tank with (for whatever reason) a particularly vulnerable population (the tetras).
Edit: And yes, it was predisolved in tank water before being added to the tank.
Edit: And yes, it was predisolved in tank water before being added to the tank.
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