I have not had a scopas tang but here is some info I found online for you. Scopas Tang
Even though this article says that it should not be in a tank smaller than 75 gallons Its wrong. I think it should not be housed in a tank less than a 100 gallons and that would go for any other tangs too. If you are going to have the scopas in the 90 gallon for a short time then move it to the 120 it will be fine. But if you keep it in the 90 for its life than you will have the same problems you had with the hippo ich. HTH
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