Always makes me sad to lose a fish. Not in the same way as a dog or cat but still sad. My Melvin the melanarus wrasse lived a normal lifespan and I was sad to see him go but happy to know it wasnt because of something I did or didnt do. My oldest fish at the moment is Nemo, had him about seven years now. Lost his mate, was a jumper, and is now a female nemo with a new partner the past couple years lol.