Hello~
Hm, Well Gouramis can be nice and there are many different kinds. Mollies seem to do well and are pretty hardy. Angel fish are always beautiful to look at, alot of folks say they can be picky to keep, but I've had one that has survived my learning stage/beginner mistakes. I like the look of parrot fish with so many different colors, but I"m not sure how easy they are to keep, plus they are a little pricey. Maybe some cichlids that don't get very large, like the dwarfs. There are so many possiblities. You could make brackish water and keep puffer fish, they may be picky though. I'm really not helping here I think, lol. You'll just have to take your time and look many places till you see some fish that just strike you. Good luck!
~Melissa~