All 3 of my angels get along great. My blueface and Emperor have been together for 2 years. My queen has been in the mix for about 5 months and there have been no issues.
I had the emperor first as a juvi, I added the blueface prior to the emperor changing and then added the queen.
If you are going to add multiple angels you need to add them together if that is not possible then you need to move the aquascaping to mix up the territories.