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Salt water fish should not be kept in fresh water. I dont how long they will survive but you shouldnt keep them in fresh water at all. If you have an emergency and you need to put them in fresh water, try to keep them in there for as short of a time as possible

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13y ago

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Not very long, it will soon run out of air, and the building ammonia in the water will kill him too, about 1-2 days at the very most.

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10y ago
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Q: How long can a salt water fish live in just plain water?
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