an EBJD and a gold severum would look badass in that tank, and possibly a bichir, imo they all would fit perfect. idk about all these people sayin 1 JD in a 55 alone.
I have no experience but from questions I've asked for future reference.....
If you like the Bichirs you can fit 3 comfortably alone in a 55Gal. (what I've been told) Sens/Dels
But to mix up the tank a bit I would have to go with A Sen a Del and I was going to possibly do a Salvini with some "buffer fish". That or Bichir and a couple Tinfoil barbs I think would be neat....
I'd say pick one or two of the fish you have chosen as "Show" fish and get some filler.
my JD is so non aggressive its pathetic he is affard of eveyone and anything. i never seen him even try to be territorial. thats why i was thinking about the discus. could i have a gold severum