This is a tough call. In a reef system many fish often seem immune to the disease. Yet, because fish are in the system the disease is often still present.
In any case, you need to continue treatment for about 7 to 14 more days. Sometimes the disease has a very long life cycle.
After that time, about all you can do is reintroduce the clown and see what happens. If nothing happens, then all is well. If the fish gets reinfected, you'll need to move all your fish to the QT tank, and treat them for 14 - 21 days.
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