heater malfunction

[Monster VooDoo Fish]

I use a won brother titanium heater. I use a 300w on my 150g. Hopefully not enough to cook my fish if its gets bumped on all day.

Now that its summer, I turn all my heaters way down to 70deg. the tanks stay at room temp 75deg. or so..

Ever stick your hand in the tank and get zapped from a broken heater..? it tingles..