I once worked for a firm where someone had a large aquarium. Somebody came in to clean it one day, and the aquarium broke and flooded the office. I think they managed to save some of the fish.
Me, I just have a cat; fortunately, he doesn't require cleaning, chemicals, or temperature regulation. :-p
Giant clam shell---you can probably pick one up on ebay for a few hundred...clams. :)
I used to have one, got it at Pier 1 in the seventies. Size of a baby's cradle it was. No excuse, had money coming out of my eyes at the time.