heater issue

hi all i have a 100g tank and for some reason as of this week the tank is running hotter than it should. i have a hydros controller where the heater is plug in and back up temp prob just to be safe. i can confirm the heater is off and getting no power to it but the tank is still sitting at 80-81...

I decided to check my temperature today on my 32.5G, and it’s reading 85 degrees Fahrenheit…. All my fish seem to be okay, not gasping for my air or anything… All of my corals are good… I just have some gonis that won’t open up all the way but I’ll be testing my other parameters later this week...

I got home and noticed the tank glass (40 g breeder) was WARM TO THE TOUCH and checked the thermometer which read nearly 100 degrees f!!! Holy cow I was freaking out. I lowered the temp by opening the lid (when I opened it the water was literally steaming!), opening windows and doors and turning...

I have a finnex heaters with a controller. The temp prob has a hard white thing that builds up at the base of the wire. The titanium rod used for stray voltage is brown and has some blueish green build up on it. The titanium rod was placed just in case not because I had stray voltage. My...

Long story short. Yesterday I was cleaning my skimmer, and accidentally spilled water over the back of my AIO. And it somehow found its way perfectly onto my power cord where the heater is plugged into the extension power cord. I heard fizzling, and small amounts of sparks, and smoke. So I...