The demeanor of the fish will depend on how big it is and in what order you added it. However, it won't stray too far from the usual of highly aggressive. That being said, my personal experience with one is that it does fine with bigger tangs such as naso and vlamingiis, but were extremely aggressive towards other genuses of tangs such as zebrasoma and of course, acanthurus itself. I was unable to add any other tang after the sohal was there, but it wasn't aggressive towards the clownfish or angelfish. The sohal was the only fish the angels never tried to pick on and the sohal itself was smaller than the angel (emperor, blueface). As you can tell, these are aggressive fish even at a small size; they are agile, quick, and very mean when they decide to go into killer mode. As mean as they are, they are very very beautiful fish, and a full grown specimen, even "full grown" in captivity with the long streamers makes it a beauty of a fish.