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I am in the camp that does not believe all tanks have ich. If you do have it I believe it can be lurking and at some point reappear. I have quarantined my fish and never had a problem and from time to time they have been stressed. I also think the theory of the parasite losing the ability to reproduce after some period of time holds some merit.
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John
100 gallon DT and 50 gallon sump with refugium. Reefbreeders Photon V2+.
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