Discus would be cool but a lack of experience could prove disasterous, they do need special care and wont always take the food you give the entire tank, in all, you cant go wrong with any of the suggestion, Although discus arent the easiest they are do able
In the same boat with the same size tank. I have about 8 roseline sharks and 5 bosami rainbows in my buddy's tank while I re-do mine. Thinking I will be taking the rainbows back, although I know he hopes I don't. I then plan on a large school of smaller tetras or such. Haven't decided on clean-up yet, as well as possible odd balls
Oh, I'd love a tetra tank, with different schools of tetra, or maybe a barb tank with a school of each kind...cories of course. I've always wanted to have gouramis, or you could have the largest female betta sorority ever!