I love tangs too and am trying my best to resist! Right now I have a 125G with:
Powder Brown Tang (5+")
Purple Tang (4+")
Hippo Tang (4+")
The PBT definitely chases the other two around. When I first put them together the PBT was super aggressive. Now they follow each other around and rarely fight. I say I am trying to resist because I want one more!!!! :( Id love to add a Naso or Yellow to my tank. All my other fish are small:
(2) Purple Firefish
Green Mandarin
Randall's Goby
Midas Blenny
TailSpot Blenny
(2) Clowns
Lawnmower Blenny
6-line Wrasse
Im running a modified GSA Shorty.
Eventually Id like to add another wrasse to the mix... but like others here say, must do things SLOW. Those fishes look super nice, but my tank is also running the best it has ever been and I dont want to chance anything. This time around I started being extra careful (QT, good husbandry, etc).