A tetra is like a tiny, colorful underwater potato with fins. It swims around in the water, looking a bit like a mini flying saucer that forgot to take off. Imagine a small, glittery disco ball but with scales instead of sparkles, and it likes to hang out with its friends in schools, forming tiny aquatic mobs. They don’t have much to say—just some little bubbles and flips here and there—as they munch on super small things that look like pepper flakes. Tetras are also the kind of fish that think they're always in a beauty contest with bright colors, but really, they're just trying to avoid the big fish who might consider them as a snack.