Depending on how severe the stunting is, it can affect the health of the fish, to the point of death. Unless you are on top of your game with planted tanks, and discus, I really do not recommend combining the two together. The two systems have completely different maintenance schedules, and finding the right balance to maintain both, while still providing the proper housing isn't easy. I would also recommend that you purchase at least 2 more discus, but preferably 4 more discus. They will do better in a larger group.