It's a Female RTM. However, it might have a something else in it. The color isn't sharp yet and most RTM, still show a more gold hue with their black marks and red tones. I wonder is the tail fin spot is mayan or festae even. But it's unlikely. Start feeding Krill, Spriulina, and a high end pellet, hope for some colors to pop, then you'll know what she is.