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That is flowering Cabomba, looks to be Green. If light is high enough in your tank it will flower regularly. My Cabomba Furcata flowers regularly every few months and just finished up.
Yep cabomba for sure. I've gotten some in that looks like that and labeled as both green cabomba or purple cabomba, although some of the other green cabombas I"ve had before are a solid deeper green color.