Hubbie and I both think it was the heater. The power strip kept functioning despite this. It had a light, a canister filter, a HOB filter and an air pump all still running. I had smelled it burning about a month ago, the level in the tank had fallen (it's on my QT in the basement) and I thought the strip was getting sprayed so topped the tank up and it seemed to get better. HAHA Today I decided to do some work on the QT, went to unplug the canister and found this. Just a bit shocked!