The easiest route would be a single medium/large Central american cichlid (green terror, red devil, Jack Dempsey). It would have to be kept alone, but would make a nice "mascot" fish. You might be able to get one donated from a local fish store as they often have people looking to off load fish that have gotten too big. Another option is an African Rift Lake cichlid tank. That would require a little more research and work (money) on your part. Just make sure there is a faculty member willing to care for the fish during the summer months and on into the future.