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Some fish may die of stress of shipping. In another case, one fish may be the dominant one in a tank. So, if you put a larger fish to the tank, the "dominant" one will picture it as a threat and attack it until it is out of the way or is dead.

Another reason is that if the aquarium is newly setup, or has been cleaned too thoroughly, you will be in the middle of an ammonia or nitrite spike, which will kill the fish quite quickly. If your tank has been negelected, or not cleaned regularily, you could also have high nitrates, causing death of the newly introduced fish, even if the old fish are ok.

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14y ago

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