reefraf

i am looking to add some fish. Since i have had prior problems with semi-aggressive fish, i typically stick to only peaceful fish. I am definately getting a heptus tang (spelling) and would also love to add a yellow tang at the same time. the yellow tang does say semi-aggressive especially toward other tangs.

I see these two together in alot of tanks. Does anyone have experience with both or how aggressive a yellow tang really is.
I really dont want to put him in my tank then have to rip the tank apart a month later to get him out.

thanks