These will be between 3.25 and 3.75 inches with most being 3.5 inches. These are a beautiful brilliant red and turquoise as juveniles and already have much of their coloration. As they mature the red and blue will become more contrasted and shimmering ending in a beautiful intense, almost flourescent red with a distinct turquiose pattern when they are fully mature. The amount and type of pattern on them can vary significantely. 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 coloration/pattern of each can vary.The Discus you are purchasing is a juvenile. Discus will not show their full pattern and final coloration as in the picture until fully mature at around 5-6 inches.