I know that the silver one is female , But i need to determine the sex of the yellow head, whether it is male or female, Knowing that they are completely in harmony with each other Haitham Halabi Can anyone ID the sub species of silver dollar these are? They dont look anything like my red hooks or black bars. Theyve got rosey cheeks and red tinges on all of their fins. They do the little Collecting Silver Dollar Varieties Mid American Rare Coin Galleries Silver dollar fish help!!!! Aquarium Advice Forum Community Silver Dollar (Metynnis argenteus) The Free Freshwater and Saltwater Aquarium Encyclopedia Anyone Can Edit The Aquarium Wiki Are My Fish Mating?!? I Thought They Were Males!! General Discussion Forum