You have 2 choices: learn to live with it or take steps to eliminate the ich properly.
The second choice is quite drastic if done properly and most people have neither the time nor the patience. You must remove EVERY FISH from your display system. Then you must place them in a q-tank and treat with copper or hyposalinity over the course of weeks. You must leave the display tank fallow (fishless) for AT LEAST 1 month, but preferably longer. Thereafter in order to keep ich out of your system you must quarantine each and every single thing you put in your tank.
As you can see, simply getting the fish out of a tank full of live rock will be a massive chore.
The first choice is what most people do and it's fine as the fish (esp. the tangs) will often go into a chronic low level infection - sometimes you sees the spots, sometimes you don't, but it's always there. If the tank is healthy, you feed right, etc, etc, things usually go OK. However, there's always the spectre that if anything goes out of whack the ich may come back with a sudden vengeance.
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