You will need to quarantine all of your fish in a hyposalinty quarantine (1.009) for at least 2 weeks. Then slowly raise the salinity to your regular level over another period of 2 weeks. You need to quarantine all you fish because they are likely hosting the ich, but not showing any signs.
I'm not sure if this is enough time for the ich to die off in your display tank. Someone else may be able to chime in here.
Did you quarantine the tang before you added it to your display tank?
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