I get very attached to individual fish that I've had for a while. Schoolers, not so much. I'm always sad when one dies, but its a general sadness for the loss of a life and the guilt that maybe I could have done more to prevent it. But with fish that I know personally, like my goldfish that I've had for years and the betta I just lost this morning, tears get shed. He greeted me every time I sat down at my computer and would jump to snag bloodworms out of the turkey baster. He would flare at his ADF companion, and follow my finger. How can you not be sad when something that has brought months to years of joy dies through no fault of their own?