I found a youtube in the one in Vieques. The one we were in was just as bright and calm, lots of fish and bug activity so a real light show. But that was 1980. Had herd a decade or so after that, that is was in a decline. Glad you were able to experience it.
Recently that bay was in the news because of some type of invasive organism in the water, most likely due to untreated sewage.
Although when I was there I hardly got any poop in my mouth at all.