ANSWERS: 2
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Depends on the fish. Goldfish can live fine, but other fish hence the running filter help oxygenate the water so fish can break, but without it soon or later fish will die.
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yup.. that is why we use airaters, there are some top breathing fish that don't need as much oxygene in water, they can litterally live in puddles, amoung these are the Beta (siamese fighting fish) and the goldfish
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