The short circuits baffled electricians as well as staff at the Sea Star Aquarium in Coburg, Germany. They decided to solve the mysterious blackouts and took shifts sleeping on the floor at night.
Staff now believe that a bright light shining into his aquarium had annoyed the octopus. He discovered by climbing onto the ring of his tank and squirting a jet of water in the lights direction, it went out.
It was only discovered on the third night that Otto was responsible for the chaos.
Electricians have now moved the 2000 Watt spot light higher so that he should not be able to reach it. However, a more careful eye is being watched on him, as he gets up to all sorts of stunts, especially when the aquarium is closed for winter and does not get as much attention. They will also give him more toys to play with.
A spokesperson said:
"It was a serious matter because it shorted the electricity supply to the whole aquarium that threatened the lives of the other animals when water pumps ceased to work".
Otto has been seen juggling the hermit crabs, throwing stones against the glass damaging it. And now and again he completely re-arranges his tank to make it suit his own taste better. He's not worried about the distress he causes his fellow tank inhabitants.