Tetra Color Fade??

[BowMaster]

I just noticed this, this morning. I don't know how long it's been going on. I thought you guys could enlighten me. Why does my Cardinal, and Rummynose Tetra's red color fade at night.

It seems to start coming back within about 10-15 minutes.

As I understand, the Rummynose Tetra's red color fades when they get stressed. But why would sleeping stress them out?

Lyle

 

[plah831]

my fish do that, too, at night. Even some of my nocturnal bottom feeders. They always have, and stay pale all night. I don't think they're necessarily stressed out. I think maybe it's just a defense mechanism to help them look more washed out at night, to blend in with the moonlight or something?

But it's normal, as far as I know. Almost all my fish do it, and they're positively thriving!

 

[bettagurl]

my neons did that every night,its completly normal.

 

[jm1212]

i think its more to conserve energy.
what use will bright blue and red colors have if its pitch black?

 

[icecubez189]

my Black Phantom Tetras look absolutely gorgeous at night for some reason. the males get really Jet Black in color and theres that spot right behind their gills that turn grey/silver and sky blue. The females glow black and red. after a while, when they are asleep, their colors become more drained and their bodies are almost transparent.