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I have ich in my tank, and there is pretty much nothing I can do about it, so I'm googling to practice ich management. I want all future fish to be quarantined to prevent worse diseases, velvet, brook, etc. My worry is when quarantined the fishes immune system is basically removed and putting it in a tank with ich may kill it? Would just observing for 4-8 weeks be enough to make sure there is nothing worse than ich?