Freshwater catfish are a diverse group of fish found in almost every freshwater habitat around the world. They are bottom-dwelling fish known for their scavenging abilities and are often kept in aquariums to help keep the tank clean. There are numerous species of freshwater catfish, ranging in size from a few inches to several feet long. Some of the more popular species include the channel catfish, cory catfish, and pleco. Many species of catfish have a reputation for being hardy and easy to care for, making them a great choice for beginner aquarists. They also come in a variety of colors and patterns, making them a popular choice for adding visual interest to an aquarium.