Watching someone's fish for them, all is well but,

there was an event.
i opened the cover to one tank and the whole cover fell into the tank light included. I was thinking this is NOT GOOD! As the light flickered out underwater. i thought i better act quickly or the fish are going to get electrocuted. I did not want to get killed either, so i unplugged EVERYTHING and proceeded to remove the light from the tank. The whole time the fish did not seem to care at all.

The cover is back on, minus the light. The light is drying in another room. I think they have ground fault wiring in that house, so that's what saved the fish from getting into fried fish.