01-25-2013, 11:02 PM
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Knowing a bit more about your situation would be helpful - was this a new tank or just new fish being added to an existing tank? If it's the latter, are there other fish in the tank and, if so, have you noticed any changes in the condition of the other fish? If it's the former, how long has the tank been active, what process of cycling the tank did you follow, what size is the tank, etc?
ETA - I am sorry for your loss.