, tangs are only a problem when not properly qt
or placed in a stressful environment. I would agree that pacific blue (dori) and some are more prone to ick though. My Orange shoulder and Yellow tang have not had a problem even when others did have ick.
If planning on a tang or angels I would highly recommend getting a cleaner shrimp or two established in the tank. I know they are not a cure for ick, but as a prevention method I think they are awesome.