I've done it before but that is only because I noticed my niger trigger was covered in flukes. After 5mins in a freshwater dip, they all jumped off and he felt like a new fish!
Make sure you add some alk to the water. Just enough to raise the PH of the freshwater to seawater levels. Also make sure its very well oxygenated and match the temps of your QT.
With that said, freshwater dips wont do anything for the more common issues like ich/velvet/brook.
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