Tetra fish are small, colorful freshwater fish popular in home aquariums. They belong to the family Characidae and are known for their peaceful nature, making them ideal for community tanks. Common species include the Neon Tetra, Cardinal Tetra, and Black Skirt Tetra. They thrive in schools, requiring groups of at least six to feel secure. These fish are native to the rivers and streams of South America and Africa. Tetras typically grow to about 1 to 2 inches in length and prefer warm, slightly acidic water. They are omnivorous, feeding on a diet of flakes, pellets, and live or frozen foods.