C. personfifer has about 2/3 of the caudal fin covered in black. Yours looks like it is developing black more towards the end of the caudal fin but in C. personifer the front part is black.
Actually, looking more closely now, mine isn't exactly like yours. On mine, it is simply darker at the base, and only the outer edge of the tail is bright yellow. It's tough to photograph, and changes with her mood (sometimes really dark, sometimes barely visible).
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