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Just wanting to know if yellow bettas ever change color?

I have a very lovely quite dark yellow VT boy
 

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They do if they have the marble gene, which many seem to have.
 

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I had a yellow Crowntail once. Over time he got a black head, and a few grey patches. And like bettafish15 said, the marble gene tends to take place if such happens. Only time will tell, really.
 
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