Orchid Dottyback Lifespan?

[Madreefer]

So i've had this dottyback for i think about 8-9 years now. He has turned in to a real PIA in the last 6 months or so. Any new additions he pesters and attacks and the other day resulted in him killing a wrasse. I know all about traps so not looking for tips on that as i've tried and he is to wise for that. I'm also not about to start taking my rockwork apart and busting up my SPS to get him out. Basically just asking those who've owned one of these fish about how long the've kept them alive? I'm hoping he passes on soon.