Buy one of those cigarette lighters with a blue LED light on the end.
Make sure the room is totally dark; no indirect lighting coming from outside or in the house.
It is 5 times the experience you saw but don't trip and fall on anything.
Some corals fluoresce. Some look brown by day and under ordinary reef lights but not under the blue LED
When that kind of light hits a coral, the coral produces and "enzyme" that causes the florescence.
In September last year it was discovered that some fish fluoresce.
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