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My heater started sparking and the plug started smoking I wasn't home to fix it and within two minutes everything was dead. I lost a yellow tang a chromis two clown fish and lots of hermits and snails
Darn, I had a heater fail on me while I was cycling but obviously nowhere near the same problem as you have. Hope all gets sorted and if you stick with the tank check for heavy metals (from the heater) beforehand in case electrocution isn't the only problem.