I agree with sapgranth in that, if anything, it is the flame angels that are more likely to bother corals than coral beauties would. But at the same time I also agree with Skippy that it's really hit or miss. I would say most of the time coral beauties will be very well behaved and not bother any corals, but there are few exceptions out there, and I've seen those few personally. I wouldn't say it's an extremely rare case. I think it happens... This seems to be the common thing among all considered reef safe dwarf angels out there including flame and potters. They are generally ok, but there are few exceptions. The other thing to add is that I noticed my flame angel begin to bother corals few months after I got him. So sometimes, if you get one of those "exception" ones out there, it may take a long while for them to fully adjust to the environment before "unleashing" their true-self.
Going back to the original question... Yes, coral beauty and yellow tang should get along fine... Just avoid adding another fish that is closely related to either of the two though as they both become pretty aggressive against their own kinds.
