When my tailspot wrasse that I'd had for 4 years (he was full grown and "second hand" when I got him) got too inquisitive of my crocea and met his demise I was heartbroken.
I did think about giving away my butthead regal tang last year but my husband (of all people. this is the guy that rolls his eyes heavily when I start to over nerd-out about my tank in his presence
) was quite upset so I kept him. He's not aggressive but very dominant of all the other fish. I'm hoping a tank move might shake things up a little and mellow him out more.