Alfie Pet by Petoga Couture - Jan Hang-on Nursery Fish Tank with Isolation Breeding Hatchery Dimension: 10" long; 5.75" wide and 6" high. Ideal as maturation tank for fry, or isolation tank for aggressive or injured fish. Safely separates new-born fry from mother and other fish. Space saving design that hangs on the inside of the aquarium. Easy to assemble.