My friend is doing her 8th grade science project on how caffeine affects fish. The site she got the idea from said that caffeine does not hurt fish in any way. I'm doubting this and was wondering if anybody could tell me if it's true or not (without harming the fish). Also, to my horror, I asked her how it was going along and she said she got 4 comet goldfish that died. I asked her what size tank she had and she just shrugged and said she had 2 in one goldfish bowl and 2 in a another. She had no filter at all, and no aeration either. I was like "Oh my god, goldfish need like 20 gallons per fish and an extra ten for each additional fish!" and she was just like "Nah, they'll be fine." Then the fish died. And honestly, I don't blame the fish. I would have died too if I was cramped like that. Anyways... could anybody tell me if the caffeine thing is true?