try to feed him with food soaked in garlic. I am not totally convince that ich will be gone if your tank go fishless for 7 Long weeks. I always think ich is like getting a cold for human. It comes and go. the best is encourage it to eat and let the fish fight off the parasite.
This was my story, I never got ich in my tank, then i bought a fish from fish store who quarantine their fishes in copper. Still, i brought it home and it got ich the next day. I just leave it in there and encourage it to eat, now it is all good.
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