Keep us updated, I am interested. Now that I know mine is not a yellow tail this does not matter much, but the Azure Damsel I have is definitely aggressive when he finds a place to hide he likes and does not want any other fish into his spot. He stole the spot from one of my chromis and now at lights out, the chromis hides behind my return.
I always try to buy at least 2 juvenile ones. As they get bigger they seem to spend most of the time worrying about each other and don't pay attention to anything else. I've had really good luck with the captive bred Azures. I have three in with a copperband butterfly, pair of flame angels, blue star leopard wrasse, moyeri leopard wrasse, exquisite leopard, yellow coris, and a Melanurus wrasse. No problems at all.