ISTA Hang-On Breeding BoxThe ISTA breeding box is intended to hang on the back of the aquarium, therefore not occupying space in the aquarium. Suitable for breeding fish, rearing baby fry, rearing shrimp, or isolating sick aggressive fish. When used for breeding, a removable divider allows isolating the female fish to protect the baby fry from being eaten. Note: A separate air pump is required to circulate water from the main aquarium into the breeder box. Air pump is not