we bought it a few days ago, put it in a new 10 gal aquarium. For the first few hours, it seemed to work ok (red light), raising the temp from 68 to 78 in a few hours. But once it reached the target temperature and the light turned green, it stayed green forever and never heated again, as the water gradually went back to 68 over the next couple of days. I even took it out, unplugged it a few times, put it under a faucet with cold water coming out, in hopes of waking up the thermostat, but the heater light permanently stayed green and never heated again...
What a piece of junk. Returning back to Walmart.
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