When I was a kid I had an aquarium with tropical fish that I took great pride in and fussed over it daily to feed the fish, watch over the temperature, keep it clean, etc.
Once the family took a vacation and I was worried about my fish. My mom assured me that my uncle would feed my fish every day, etc and it would be fine.
When we got back home from the trip the fish were all gone, the tank was only half full and the water was all dirty. I never got a straight answer on what happened to it.
But, I started over and set up the aquarium again and kept it for years afterward.