Tetras are a colorful and varied group of small freshwater fish from the Characiformes order, encompassing over 100 recognized species across three families: Alestidae, Characidae, and Lebiasinidae. Renowned for their dynamic colors and patterns, tetras are a favorite in many aquariums. Typically, tetras have diamond-shaped bodies and a distinctive small fin between their dorsal and caudal fins. Most tetras are relatively small, with numerous species averaging about an inch in length. They are sociable creatures that thrive in groups and are commonly found in diverse habitats such as rivers, streams, and lakes with plenty of submerged plants. Their omnivorous diet and ability to adapt to various water conditions make them ideal for both beginner and seasoned aquarists. Tetras are often chosen for community tanks because of their vivid hues and peaceful demeanor. To keep them healthy and active, it's crucial to maintain specific water parameters: Temperature should be between 70°F (21°C) and 80°F (27°C), pH levels should be slightly acidic to neutral, ranging from 6.0 to 7.5, and water hardness should be soft to moderately hard, between 2 to 10 dGH. Consistent monitoring and upkeep of these conditions are vital for providing a stable environment for tetras to flourish. Consistency is the key to ensuring your fish's well-being.