As stated before there are sooo many types of fish you could put in the tank. Some of my personal favorites or fish I wish I had room for that wouldn't outgrow that tank would include electric blue jack Dempseys, jack dempsey's, green terrors, chocolate cichlids, severums (not for sure on those last 2, they're on my want list but I think they'd fit long term), and carpintis/Texas cichlids. That's all I can think of off the top of my head that I would like but there are many many more and everyone will have their recommendations. (Not recommending all of these in the same tank at once btw)