The Electricity would take the best possible root to ground....since you don't have a ground probe or anything the only way for the electricity to flow is the same way it came in, through the neutral conductor on the fan which would result in a dead short which should have tripped the breaker.....So in short your Fishy family would have recieved a minor electrical shock, and for the most should be fine.....depends on how long it took for the breaker to pop if it ever did???
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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