Just had an Aquarium Heater basically blow it's top! The unit blew and popped open, and in removing it I took a nasty shock. I don't think it got the fish as they are acting well. Im not...still twitching lol.....But water that ws in the heater got in the tank spurring a 50% or better water change in a hurry. This particular heater came in a Marineland 10 gal
kit, so if you have one you may wanna keep an eye on it!