Dipping creates massive stress on the fish but doesn't kill the ich. There are more than the visual signs of ich that can be on the fish. There can be ich embedded under the skin, in the gills and in the process of falling off of the fish itself. Dipping in a freshwater bath with chemicals will not kill all forms of the ich on the fish. May kill one form but not the others that are still eating the fish and that will fall off and multiply after the fish is in your main tank.
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Freed
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