I know it's tempting...maybe one more....but, the thing with Discus is they are Cichlids themselves, after all, and thus are territorial. I'd be patient and see how the two you have get along. Maybe you got lucky and have a male and female already.
Another thing with Discus is....they can be tough to keep. Even the captive bred. The less stress, the better, IMO. Having said that, 4 would be too many, IMO. I used to keep 5 at the most in a 90.
Long story short, hold off with just the two and get a small school of tetras, IMO.
Cheers,
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Mark.
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