Last night his return pipe came undone when he was out of the apartment. Somewhere between 5 and 10 gallons pumped itself out onto the floor, and down the floor into the apartment below. It was apparently 'spraying' out of the wall for a few seconds.
Things are ok now, and clamps will be on it soon. I took new pictures of the tank last night, I'll try to get them posted by the end of the weekend.