I've be pretty reluctant to purchase a fish that was covered in a parasite that required medicinal treatment and a fresh water dip. SW fish are expensive and its easy enough to find healthy specimens where I shop. I suppose if you were just given a free fish to rescue it would be worth while. But I certainly wouldn't subject an otherwise healthy fish to the stress of a freshwater dip out of paranoia.
I have however freshwater dipped several tridacnids that were suffering from pinched mantle with success.
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