Dr. Turtle is a slow-release medicated sulfa block that helps prevent common bacterial and fungal diseases associated with water turtles, other aquatic reptiles and aquatic amphibians. One Dr Turtle treats up to 15 gallons of water.Why We Love It:Dr. Turtle is a slow-release medicated sulfa block that helps prevent common bacterial and fungal diseases associated with water turtles, other aquatic reptiles and aquatic amphibiansOne Dr Turtle treats up to 15 gallons of waterAbout Zoo MedHere at Zoo Med, animals are our passion, and for over 40 years we have made it our mission to supply the very best in exotic pet foods, reptile products, and reptile habitats. As a company made up of reptile hobbyists, we strive to provide the supplies and knowledge needed to successfully care for reptiles, amphibians, fish, insects and other exotic pets to keep them happy and healthy.