Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
A good-sized group of near adult discus would look superb in that size of tank, and if you are considering them, you could definitely keep them with your other planned tank-mates, (e.g. the Cardinals, Preacox, Rummy-Noses, Rams & Cories) which are compatible with discus and can handle the higher discus temps.
But I suggest you should omit to include Roseline Sharks, which get quite large, are very active, and may tend to be somewhat aggressive, stressing the discus, - and the Chinese Algae eaters, for the same reasons, and also because they would likely tend to take a liking to discus' slime coatings as part of theit diet, as they get older, larger, fatter and lazier.
Best of luck to you no matter what you decide to do.