I had a hippo tang for 16 years, he died last year. Every time the fish got stressed he would get ich. Usually that stress would be adding a new fish, happened 3 or 4 times over his life span. It was never really bad but you could just make it out. Always went away when his stress level dropped. No other fish in the tank ever got it that I could see. I never treated him and he lived a long healthy life.
Hippo tangs are highly susceptible to ich. The stress of moving him from your quarantine tank to your main tank is likely setting him off.
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