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I set up a fish tank about 3 weeks ago and totally neglected the nitrogen cycle. Now, I've done much research and my ignorance is coming back to haunt me, but I want a fish expert to interpret these results for me. I've had the tank for 3 weeks. The tank size is 20 gallons When I first got...

...do all of his fish live? He just adds water and dechlorinator and nothing else. He's probably never heard of the "nitrogen cycle" and yet his fish all live and don't seem to have any problems. How?