Glass cats are beautiful and IMO very underrated. They ARE a schooling fish, so get a good amount and they are at there best in a heavily planted tank, discus look great in planted tanks too. I would not do the BGK and Clown Loaches, not do to size as much as preferance. Alot of people will say NO to what I'm about to say, but T-Barbs look amazing in a 55planted tank, and tend to not be as nasty when in larger schools, that has been my experience. I've never kept discus, but have kept glass cats, and currently keep T-barbs.
-So in short, long flowy plants(real or fake), discus, ghost cat school and t-barb school.