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It's normal. They often lose their color when there is no light. You will notice that within a few minutes the color is back and so is their normal activity level. Nothing to worry about. If this happens during the course of the day it is a good indication of stress, but at night when the lights are first turned on it is normal and nothing to worry about.
 

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OPEFE
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10,249 Posts
Pretty normal...color gets back within a minute!

Their bellys get white when they are too stressed/scary too!
 

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I Have No Fish but I Have Japanese Girls On My Ava
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18,487 Posts
Normal. They do tend to loose their coloring when relaxed, inactive, before and after sleep. Dont worry, they willl gain coloration when awake and/or fully active.
 

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Captain Britannia
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mine do this every night actually all the reds i have kept have done this.
my piraya on the other hand never loses its colour but then its got a lot more than the reds to lose
dixon
 

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5 TIME CHAMPS
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Neoplasia said:
It's normal. They often lose their color when there is no light. You will notice that within a few minutes the color is back and so is their normal activity level. Nothing to worry about. If this happens during the course of the day it is a good indication of stress, but at night when the lights are first turned on it is normal and nothing to worry about.
 

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yeah there are many fish that have different colour patterns to express different signals... you should see some of my cichlids I have :smile:
If only we could change colour like fish do, now wouldnt that be cool
 
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