[atteb]

Just wanting to know if yellow bettas ever change color?

I have a very lovely quite dark yellow VT boy

 

[bettafish15]

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

 

[Moclam]

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.