I figured I would update this with how the fish is doing now. This is the meanest fish I have ever had....by far.
It doesn't endlessly chase any fish, but it "goes after" everything. When I feed nori, it is the first to feed. It won't let anything near it till it's done. Then, it will swim away, the others will come in and try to eat, but the tang will come back, chase them away and just hover there.
During the day, it will swim around, then take a lunge at the other tang or angel. It's just like the school bully who scares the other kids....lol. The only fish it doesn't bother are clowns. The bartlett anthias don't seem to be bothered by it, but the dispars all hide when it swims near them. It also must have found the cave for my watchman/pistol shrimp in the back of the tank somwhere. It will disappear behind the rocks, I'll hear the pistol snap and then the tang will swim back out in the open.
All in all, a great looking fish, but I would call it pretty aggressive.