Well, if your fish are healthy, chances are still good for a positive outcome. With my 1st episode, I didn't have a QT, and had no choice but to treat with some "reef safe" chemicals. Fortunately, none of my original fish died, but the new ones did.
The product I used then was Medic by Polyplab at triple dosage for a full month. The new fish didn't survive, but after a few iterations on my original tank residents, the ich finally went away. I did UV at the same time. So not saying this product works, but in my case, at least all my original tank inhabitants survived.
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