Is food coloring safe to add to the aquarium? No, I'm not interested in doing so, but the question came to mind while coloring eggs. I thought, "Why spend $ on lighting that is going to make the water look a certain way when a few drops of color will do?". Of course, to remove the color would be a bit more difficult than switching a switch, but for the sake of curiosity...? You could add:
blue- for the ocean effect
green- for the deep lake effect
yellow- for the public swimming area effect
orange (or purple)- for the "old timers" psychedelic effect
red- for the freshly fed live feed ripped to shreds by sharks effect (when you only have a peaceful community tank!)
blue- for the ocean effect
green- for the deep lake effect
yellow- for the public swimming area effect
orange (or purple)- for the "old timers" psychedelic effect
red- for the freshly fed live feed ripped to shreds by sharks effect (when you only have a peaceful community tank!)