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You have a male. As they mature, the dominant male gets a dark blue purple color.
I'm waiting to see if any of mine change, I have 3 of them but I'm thinking they're all female.
How big is yours and how long have you had him?
Yah my golden is maturing right now he was bright yellow and now he's turning black.
Old picture
New one
But anything can happen he has gained silver strips and now has a darker color to it.