Betta changing from red to blue?

[trickshot3102]

I know that bettas change colors under different conditions, but the exact opposite? I have a red betta that seems to be slowly turning light blue! Is an extreme color change like that common?

 

[Delapool]

Must say I haven't kept bettas for years but never heard of that - wow!. Is it a blue substrate or something?

 

[uelissa]

In a Betta I used to have, he would change colours all the time. It was so cool!! It was pretty normal for mine.... So maybe for yours, too!