The size of the these will be between 2.25 and 2.75 inches with most being right around 2.5 inches. Red Melon Discus are often mostly white as juveniles. The ones in stock now are already mostly colored up at the 2.5 inch size, which is unusual. That likely means they will extremely colorful when mature adults. They will not have full red coloration until mature at around 5-6 inches. As juveniles, they can have different facial coloration varying from a pale orange, to completely white to a pale yellow. Red Melon Discus are derived from the Pigeon Blood strain. The picture is of a mature adult. Juvenile coloration and pattern will vary. We are always willing to try and sex our fish for a customer, but we do not guarantee it. All Discus are unique and the mature coloration/pattern of each can vary.