I find that out of the three tangs I have only the tomini has a permanent territory. The other fish pretty much switch up their spots. Not sure if thats normal or not but one day pootie will be in the back under this one rock or the anthias could be there. lol
A neat thing I've discovered, and I bet it just isn't me, how the tangs show their aggression. They will swipe at the other fish with their tail and kinda nudge them while swimming backwards and shaking their tails. I have seen it with every fish I have added so it must be a "tang" thing lol
I'll tell ya, nothing looks cooler than when all three tangs are out in the front swimming around in a group, makes me so glad I have the tank. It's all worth it when I sit in front and watch it and even from across the room it just seems so Epic. lol