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The submersible heater is made by Marineland and was sized for a 10-gallon tank, which is what I have. Absolutely nothing else was changed at the same time as the new heater. Added 1/2 gallon water two weeks prior. I don't think it was the heater shorting. Half of the fish died in the first 12...

The temperature did not fluctuate. I keep it 78-80 degrees. I did not have to raise the temperature, this was an existing aquarium, simply installed a new heater.

No, the fish did not act weird. But I don't think the heater ever actually kicked in, we're having warm weather and the water was maintaining a good temp on its own. I did rinse the heater and suction cup apparatus before putting in the tank. I have cleaned the tank out completely and will not...

On Friday I installed a new submersible heater (the old one was recalled) in my 10-gallon tank which was filled with fancy-tail guppies. The next morning almost half of the fish were dead. I removed the heater and 12 hours later the rest were gone as well. I have had the tank in use for at least...