melypr1985
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There are only two 100% effective and proven ways to kill ich. Copper treatment and TTM.
And even if h2o2 killed the parasite it's still alive and active in the tank. Period.
Well said. The ich likely just fell off like it normally would as part of it's life cycle and hasn't shown obvious symptoms due to the fish being able to fight off most of it. It's still alive and well in the fish's gills.