We had one 6 months ago that we had for about 7 months. I loved that fish! He was peaceful, with that 'happy swim' thing they do. Even though listed as semi-aggressive, unfortunately he did not stand up for himself and our tang and other things led to its surprising demise (we now have rocks in tank that we can re-arrange faster for territorial aggression, etc.).
Flash forward to now, we put another blue throat trigger in about 2 or 3 weeks ago and this guy is...SO DIFFERENT. He has managed to kill 2 out of 3 (2.5 to 3 inch) dart fish. The skunk cleaner shrimp..which are HUGE..stay under an RBTA whenever THIS trigger is out. I'm kind of in shock..I knew it was a remote possibility, but since we just had one that couldn't have been a more peaceful fish if it tried...I'm a bit stunned.
I figure the 3 chromis may be next on his hit list. Trying to ensure he is well-fed and fed more than once a day to see if that helps. We upped the feeding already it after the first dart fish was found in pieces. It's like they say, despite what a fish is 'known for', at the end of the day, they each have their own individual temperaments.
I will say neither of these fish bothered our corals....