swimming in the sea

I recently learned of these genetically engineered, fluorescent pink angelfish in Taiwan.  Proteins from a coral were injected into the fish egg to produce the vibrant hues.  According to the news report, fish use their 'bioluminescence' to communicate, attract prey and distract predators.  I like to think they glow pink when their hearts light up, as I've pictured them in my painting.  Did you know that freshwater angelfish are monogamous?