The Grech CBG-800 5W UV Sterilizer Hang-On Back Filter is a black filter designed for use in tanks with a capacity of 20-50 gallons or 211 GPH. Made by SunSun, a trusted brand, this filter is specifically designed for reptile tanks to help maintain clean water and provide necessary filtration. With its UV sterilization capabilities, it helps to keep water free from harmful bacteria and microorganisms, ensuring the health and safety of your pet. Easy to hang on the back of the tank, this filter is a convenient and effective solution for maintaining the cleanliness of your reptile’s water supply. Nib