You need to do a freshwater dip to rule out flukes for sure and I would assume all tangs have ich. Especially the way fish are kept at wholesalers. Keeping a fish by itself doesn’t clear them of ich. Ultimately it’s up to the individual, but I wouldn’t risk putting a fish that’s not fully QT’d in my display full of fish and risking hundreds of dollars worth (and years) of livestock. Fully QT’d means that the fish in question has been treated with appropriate meds to take care of the 3 problems I mentioned before, otherwise it’s not QT’d at all. But this is my definition of QT, but understand that this may not apply to other’s beliefs.
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