Take a look at the black neon tetras. They're a little bigger than neons, have a lot more personality, are a million times hardier, look very nice in the tanks, tolerate a wider range of tank temperatures, not as shy, are peaceful and may even reward you with some tank spawning! They're not as brightly colored but I can tell you than their colors will be richer and deeper once in your own tanks. I've had neons, cardinals, bleeding hearts, black skirts, rummynose and the black neons and I'd get black neons over all of these. I just got some ember tetras for the first time and I can tell you I'm liking these little guys a ton too! And they are small!