Heater malfunction or not enough water?
I just noticed my whole room smelled like hot plastic and I didn’t know what it was until I realized it was probably my tank heater. The temperature reads 81 degrees but I still unplugged it just incase. Some of the tank water has evaporated and I was gonna refill it later today and only like 2cm of it was out of the water, is that enough to make it do that?