These will be between 3.75 and 4.5 inches with most being 4inches or over. Sexing mature Discus is difficult and sexing juvenile Discus extremely difficult. 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.
Gallons needed per inch of Discus: 1.5 for 2", 2.5 for 3", 4 for 4", 6 for 5", 8 for 6"