Is this normal?

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Tjd4003

Aquarium Advice Apprentice
Joined
Apr 7, 2012
Messages
19
Location
Burlington Ontario
Last night I heard a noise and decided to check my fish tanks (thought I heard leaking) all was well with the tanks.

I did notice my cardinal tetras were almost completely white. I didn't turn their tank light on, just a light in the room. In the morning they were back to their normal cardinal red colour.

Is it normal for cardinal tetras to lose like 90% of their colour over night? They were normal colour before I turned there lights off, and fine again in the morning.
 
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