There is also a brackish lagoon outside of Bogota, Colombia that had the same density and brightness but I completely forget the name of it. That was an absolutely amazing dive, too.
Bogota is at 8,600 ft elevation, did you mean Baranquilla and La Cienega lagoon to its east?
I seem to remember a bioluminescence outside of Cartagena, Isla Baru IIRC.