I would not personally recommend discus as a tankmate. Probably the last thing I would recommend after neon tetras haha. Maybe some guy has done it, but chances of you being able to recreate his luck are slim. I would try for similarly tough CA cichlids, like glenn suggests. It will be much more difficult to do if your FH is large already, tends to work better when the fish grow together. There are some other things you can do to make it work better, like adding at least 2-3 fish at a time, putting smaller fish in tank first and let them get established, and changing the décor around when adding new fish.
CA communities are difficult to get to work, takes a bunch of shuffling and trial and error. But in a 200 you should be able to pull it off. Just keep another tank on hand established and ready for refugees