I had a Cobalt Neo-therm Heater fail on me this weekend. There was a burning smell coming from the tank and when I checked I noticed the water temp dropped to 74 degrees. I looked in my sump and the heater light was still on but not heating. There was also black goobs of product in the sump that was clouding up the water. Luckily I had a back up heater but I am worried about the black product that ozzed out of the heater. Has anybody experienced this before? I did a water change but the water is still cloudy. It is a FOWLR tank stocked with some expensive fish.



