The ISTA Hang-On Separation Box is designed to attach to the back of your aquarium, freeing up space within the tank itself. This versatile box is ideal for breeding fish, raising baby fry, rearing shrimp, or isolating sick or aggressive fish. With a size of 5.5 x 10 x 5.25 inches, this hang-on air-driven separation breeder box is perfect for separating baby or weak fish. It is easy to maintain and allows for convenient water changes without disturbing the inhabitants of the separation box. Suitable for both freshwater and saltwater aquariums, the ISTA Hang-On Separation Box offers an excellent solution for maintaining a healthy and harmonious aquatic environment.