Bought two. None of them seemed to work, then one malfunctioned and killed my daughter's fish! 3.5 gallon tank (maybe that's the problem), good water stats and healthy fish when I went to work in the morning. That evening he was standing in front of a heater that looked burned out. I checked for ammonia and it's not there. I removed both heaters as I don't want to take any more risks.
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