I am so sorry to hear this Wade. What a terrible shock that must have been for you. Others here have said that the Stealth heaters are not reliable. I have used Ebo Jaeger heaters for years and they have been good. Now I have a Rena Smart heater in my discus tank and it stays within .5 degrees of where I have it set, always. Mine is a 300 watt for my 75 gal tank. Best of luck with a new heater and some new fish. We have all had our fish disasters for sure...
Barb