In my experience, cleaner shrimp will help control the ich on the tang and will give it some relief. My tangs got ich shortly after reintroducing them to my tank after I had to re-cycle. Once I added some cleaner shrimp the ich was not visible on the fish and I haven't seen any since. This was about a year ago. I couldn't use copper based meds as I had corals in the tank. This is by no means a cure but it should help the situation. As soon as I added the shrimp the tangs swam right up to them immediately and the shrimp were crawling all over them.
Also consider getting a UV sterilizer, this should kill the ich in the water column.
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