I had one in my 1500 gallon pool for about 6 months, during which time he grew from 2" to about 8". Contradictory to almost everything I had read about this species, he was extremely belligerent toward my other fish. The aggression started at about 5" and progressively got worse with size. Granted, I was keeping him with several tangs that were of similar shape/coloration (N. unicorns(2), A. mata(2), and A. blochii). The aggression however was spread to all of the fish regardless of species/size, and it got to the point where I was unable to add any new fish (Additional tangs, angels, wrasse... etc...) without them being relentlessly pursued until they were forced to hide behind the pump housing. I ultimately had to re-home him. I likely got the exception here in terms of temperament, but thought it worth sharing.