Question Koi Betta Changing Color?

BettytheBetta1

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I bought a female koI betta a week ago, and it had suddenly changed color from white to black. Is this normal? I didn’t know that could happen.
 

Repolie

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Yes that's perfectly normal. KoI bettas have the marble gene which allows them to change colours over time.
 

Fanatic

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We have a koI betta that was completely white with translucent fins upon purchase, now he's a dark red and black with specks of blue, marble bettas will change color throughout their life.
 

Demeter

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I want pictures! Yes koI bettas are technically marbled and therefor they usually change colors over time. I've also had white fish turn black and even blue fish turn solid white.
 

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