HAPPY ENDING!! Watch the update: https://goo.gl/2cKtIs
A cobalt aquatics neo-therm heater blew up in my aquarium sump and killed my fish. Specifically, my freshwater stingrays.
TO CLARIFY: This was not an electrical issue. There was no short. A GFCI or any other safety precaution would NOT have prevented this.(Even though the heater WAS plugged into a GFCI outlet).
To elaborate on what happened with the heater: There is a wire that is coiled inside the heater. The heater is filled with a resin. In this faulty heater, the resin was not evenly distributed, allowing for the wire to heat unevenly creating hot spots within the heater. This caused the resin to heat and expand, blowing the end of the heater apart and leaking out the toxic resin into the aquarium. The heater continued to function and no voltage was leaked into the aquarium. The resin in the water is what killed the fish. Nothing else.
Whats next? Here is the update: https://www.youtube.com/watch?v=ss0nb…
I also did an hour long podcast on this story. What led up to this event: http://bit.ly/RAYSextended