Look foward to seeing what you do with this tank. My 72 was set up as a saltwater also and decided to go fresh with it. Now it is currently housing angels and various tetras. The discus would look really good, if you are buying smaller discus I know it is recommended to keep them in a bare bottom tank to make it easier on doing all the water changes needed. Thought about discus myself, but decided that the time needed to raise them properly just wouldn't work for me at this time.