Okay... so I understand my sailfin gets darker or bolder when excited or stressed. My Maroon gets darker depending on dominance. My Queen Angel is changing because she'll eventually be different colors as an adult... SO WHY IS MY BLACK CARDINALFISH TURNING WHITE? :;fru Last night I came home at 3 and as always I checked on my fishy pals...everyone except my 3 cardinals were asleep. 2 (the banggais) were zipping around the tank avoiding me and I noticed a fish that was vaguely familiar but not. At first i thought maybe the other half bought a new fish without telling me so i popped on the lights to get a better look. With the lights on I could tell it had the same cardinal shape but was almost a pure silver white with two darkening stripes on the body. I then realized this was the black cardinal I'd been worrying about...I turned off the light and went to bed thoroughly confused but swearing I'd look him up in the morning. In the morning he was back to being brownish black and I haven't been able to find ANYTHING that talks about him going snowy white in the dark... anyone have black cardinals before that can explain why he does this? is it like...a defense tactic or just one of those fishy mysteries?