Difference between Pacific and Atlantic Yellow Tangs

I didn't kow there was a true Atlantic Yellow Tang. If there is, it's an invasive species just like the (now common) lionfish.
 
Sometimes juvenile Atlantic blue tangs are sold as an Atlantic yellow tang. These fish get larger and more aggressive than a true yellow tang.
 
Alright, I know my LFS showed on facebook they had Atlantic Yellow Tangs coming in today, and I wasn't sure what the difference was between them and Pacific ones. Thanks!
 
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