What temperature do u have them at? Discus like warmer water like 28-32C (although a few people dont seem to have trouble keeping them in slightly lower temps.). They also prefer to be in groups, I would consider adding another 2-3 soon. As for adding a group of blue rams, I wouldn't consider that until another 6 months or so time.
Adding a shoal of rummynose or cardinal tetras (not neons) may help the discus to feel more secure.
Be careful adding catfish as many don't like the warmer temperatures.
How much did they set you back and were they a pair? Most discus I've seen usually sell for around ~150$ each.
edit: and if you buy more discus you should ask if you can see the fish eat first before buying.