Sorry to be the one to throw water on the fire but...
Typically, when mixing discus of such a wide variety of sizes, the small ones are gonna get bullied and will likely wind up stunted due to aggression from the bigger discus at feeding time. IMO and IME juvies grow best with others of similar size. Good luck and keep the pics coming.
Mark
Agree 100%
I personally would not mix discus like that BUT everyone is going to have different commitment/goals when keeping discus. Ideally, it's not a good discus setup.
Van