The "V" partition, which is included, is designed to help safely separate new fry from the mother. The Two-Way Guppy Breeder was engineered with wide-slotted side vents to promote water circulation that furnishes oxygen and fresh water to the fry. It also features side air tanks that allow it to float freely in the aquarium. Features - Side vents allow for optimum water flow - Comes with lid and features a removable "V" Partition - Use as a maturation tank for fry or isolation tank for injured or aggressive fish