Well, I set up my quarantine and purchased a huge , hungry PB tang and 10days after purchase, he was covered with what I thought looked like ich(I shop at Petco, so I see it alot!) I did my reading here, so I was prepared with cupramine and test (API). I removed him from my QT, which included a goby, flame and yellow eye tang who were not showing signs, and started a second QT. One day of cupramine at a level of 0.25, as best I can tell from the API test, and the fish has no signs. It is not that I think he is cured, but rather I question my diagnosis or can I expect external signs to clear up this quick with ICH? I am tapering the cupramine up, so I realize the level may be low. Only 1 day so far.