pink betta

When I first got her, she was labeled as a koi betta and had the colors of one. Now, like half a year later she has turned pink and blue. Her colors don't resemble a koi fish anymore and I'm confused.

I was at Petco earlier this week, and my local Petco has some very nice bettas, I mean drop dead gorgeous ones. I hardly ever see your standard blue and red veiltails. But I noticed this guy! Pale pink, he wasn't very active, kinda pitched forward so that he was laying at an angle. I've never...