As an automatic circulating nursery, the Penn Plax Aqua Nursery and Hatchery will keep your baby fish safe and healthy in a gentle way. This innovative breeding box Nursery draws new-born fry through a tube from the maternity section into the nursery section keeping them separate, alive and healthy. The nursery section may be lifted out separate from the maternity section and placed in other locations.The Aqua-Nursery has a constant circulation eliminating stagnant water, as well as adjustable hangers and removable top covers.Breeding your own fish is fascinating and educational, not to mention cheaper. Now it's easier and safer too.