I shut off my aerogarden last weekend, which normally provides light for my fish at a regular time (along with their tank lights.) I was gone for just under 48 hours and when I returned home, they looked like little ghosts, especially Crumb (the copper marble). Even his eyes, normally very black, turned white. Normal color returned the next morning with light treatment. The second set of photos are of what they normally look like.
I had heard about it. When I picked up Bluey to come home with me, his lights had been out for 2 days and he was green, no black, no flesh tones, just pastel green. It's amazing white light will do for their color intensity!