These will be between 2.25 to 2.75 inches with most being 2.5 inches. These are a beautiful pale blue/green as juveniles. As they mature the Ocean Green coloration will deepen ending a brilliant, vibrant, almost flourescent aquagreen when fully mature. Ocean Green juvenile Discus look almost identical, except for a very slight difference in the shade, as Brilliant Blue Diamond Discus. 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.