Without knowing the water chemistry I would say that its a big unknown. Did you just change the water before they died? Was it properly chlorinated? Temperature change in the tank? Did you use the same water temperature for the new water as what was in the tank? Sudden water temperature changes or allowing the water temperature to raise or fall outside the recommended temperature range can also be a cause.





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I found 2 of my babies, who seemed SO HEALTHY, dead this morning floating in their pond, yet the 3rd was fine hiding in his log hide on shore. I moved him to a new tank to be safe. 
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