Actually....
Owning an aquarium is probably the easiest way to kill fish next to using dynamite in a stock tank. For some reason unknown to man the probability for mortality is equal to the cost of the fish in question. Buy a queen angel, she'll croak in a day. Buy a green chromis, you can't kill em by boiling them. I once had a yellow face moray that I bought for $30 jump out of the tank, spend unknown hours on the carpet, I then saw it on the way out of the house all shriveled up, came back two hours later, tried to scrape its carcass off the floor when the dang thing MOVED! Threw it back into the aquarium and after it doubled its original size from all the dried mucus soaking back up water, it lived happily ever after. No male bovine dung.
when everything seems to be humming along nicely, the power goes out or the heater thermostat sticks and cooks the aquarium or the new fish you bought for $10 gets hungry and eats a pair of large brazillian gramas at $45 a pop.....