Keep in mind, the only proven way to "cure" a tank of ich (that is, to eradicate every parasite) is to let the tank go fallow for up to 12 weeks, while separately treating the fish with hypo, tank transfer, or copper, the latter of which isn't recommended. A riskier move is having your fish fight the parasite off naturally with high immune response brought about by great water conditions and diet (including supplements such as garlic), and after a year of not adding anymore fish and not seeing any sign of the parasite.
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