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I would guess that the chlorine killed the fish. I have lost all my water a couple of times and topped it up with totally different water and the fish were fine. I guess you could look at the input water chemistry but that would be my guess chlorine. I have well water and lake water as a source at this point in my life it would be a good idea to have a supply of declorinated water to put them in in emergencies. Before you top up just in case something like this happens again. That is a very sad state of affairs but you must go on not looking back but learning a lesson from this experience anyone who has kept koi for a period of time is going to have one of these disasters happen. I lost my entire collection once to ice and no oxygen. The pump froze up too.
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The perfect koi is always one purchase or spawning away!
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