If your tang is eating like a champ and not scratching or rubbing then I would just leave it alone. Chances are the tang is being picked on after lights out or is a bit stressed about something. I have a PB Tang that got ich all the time. I tried pretty much everything to cure it but the few spots never went away. It turned out that after lights out my sailfin tang attacked the PB. I got rid of the sailfin and the PB has never looked better.
Another possibility may be your cleaner wrasses. If your cleaner wrasses eat prepared food chances are they are not "true" cleaner wrasses. The false cleaners have been known to bite chunks out of fish.
Now for the ich in the tank business. Some may disagree...well...probably most will but this is my opinion. It won't mean much cause I'm not as cool as the other canreefers hehe. The ich parasite is always present in a tank...I don't care who you are...its there. No amount of water changes or lowering salinity or temp. will get rid of it. It doesn't matter what a reefer does, the parasite will always be there. It may die off but it will always come back.
Placing the fish in quarantine will cause stress. Cleaning the tank and/or rocks will cause stress. Your best bet right now is to just leave it alone and keep an eye on it. Good luck
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