can koi betta fish alter their colors naturally?

[Petunia]

I got her labeled as a koi betta, but that was half a year ago. She had the colors, the whole koi vibe going on. Now, her colors are completely different - pink and blue. I'm kinda lost, 'cause she doesn't look like a koi fish anymore.

[coltin]

betta fish can change color as they mature, it's not uncommon for them to shift from one color pattern to another, especially when they're still growing and developing.

[gildfish]

Kois are essentially marbles, their colors can shift. Not just as they grow, but throughout their lives - I think that's pretty cool. We'd love to see your pet, by the way!

[wyrmhide]

my guess is your betta's got the marble gene too. my own blue and white marble female, she's now more of a blue and white butterfly coloration, it's pretty interesting to see how they change.