Gave into the urge to give my qt tank one last look before bedtime, and noticed my heater giving off these weird little lines(?), so I took a quick video (I'll link below) and then unplugged it and pulled it out. Literally threw it across the room it was so hot lol, burned my poor fingers. Water immediately evaporated off of it as well. Had to have happened in the last couple hours, so glad I decided check on the tank or I might've woken up to some poached swordtails... In light of this recent scare, I'm wondering if there's any sort of probe/thermometer that'll shut off the heater if the tank gets too hot? Also, the lines in the video are just from the heat right, should I be doing a water big water change?