I think to get the true fluorescence you need to use an actual UV light source. All that is suppose to show up is the corals natural florescence, obviously if the rock is lighting up it's not quite the real thing. You can order fairly powerful UV flashlights off line for a decent price. I've always wanted to get an actual night gear filter but never got around to it. I did some similar experimenting with similar stuff to yours a while back and the results sure are interesting. I'd really like to get into it a little more so maybe I'll see what I can do.
Great photos and thanks for the inspiration.
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