:joke: Somehow that made me laugh...I mean, come on...fish aren't going to die immediately without filtration. In fact, they can live in a tank without filtration at all as long as there are consistent water changes. :hi:
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Yeah, you're right - a broken filter probably would not kill the fish in one day. However some of the new canisters are so quiet you almost have to look to see if they are running. I know mine is running by the pattern of the current that the fish food takes in the tank and by watching the output tube specifically. BUT, in a highly stocked tank you could run into ammonia problems pretty quickly. Just saying - better safe than sorry, blah blah blah...