I tried to be careful with this after seeing other reviews about overheating of the aquarium water. I almost killed my fish yesterday because I forgot I had it on and left it on for about 3-4 hours. The water was above 81 after rising from 74. I don't leave negative reviews, but this heater is dangerous. And in response to another person's assessment, not a single tank was in the sun or near any other heat source.
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