Hi DISCUSsing and welcome to Simply. Before answering questions I do suggest you spin some time in the beginner section of the forum and review the stickie threads. You will find that discus are best kept in group of five or more to help spread the aggression. Many here will recommend six to eight discus as a starting point.
While keeping other fish is a nice intro to keeping discus you will find yo will need to up your game with these fish to grow and keep them well. We do this by feeding them well and changing lots of water. Please start with the video in the first post of this thread. Start Here!. It's an hour long but well worth the time. The man in the video is the owner of this forum and knows his stuff and may stop by and personally welcome you to the forum.
Pat