If you are looking at tetras in your tank, I have been successful having bolivian rams with them. They are a cichlid, but they are not usually agressive. I have seen 2 of my b. rams fighting with eachother, but if you get one, you should be fine. If you get 2 try not to get a male and female. If they breed, they can get pretty agressive. They get about 3 inches, and they are nice fish. I have some with tetras, otos, dwarf rainbows, loaches, plecos, barbs, other b. rams, and they are getting together nicely.
Another one to think about is a small group of dwarf neon rainbowfish. They are nice fish, and are fun to watch. The females are blue and yellow with colored scales, and the males are red and blue with coloured scales- a good looking fish. I have theese with most of my fish. (almost all listed above) Make sure that you add theese later on if you plan on getting them, as they are not the best fish in the cycling process.
Try and look at some pictures of theese fish. I think they will work nicely.
If you are interested in a certain fish, them it would be a good idea to list the type, so that we can help you find the right fish, that will work for your tank.