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Then how would a fellow reefer now if there new fish they just quarantine is cured from ich. Human errors on cupramine, hypo etc can lead ich to still survive.
Post treatment observe the fish alongside a few black mollies which have no immunity to SW diseases: https://www.reef2reef.com/threads/freshwater-black-mollies-vs-marine-fish-diseases.312166/
If the mollies "hit" after 2-3 weeks you'll know any fish which shares water with them has the same disease they are showing.