Petzilla PBI-1 Aquarium Fish Breeder Box for Hatchery Prevent the baby fish from the adult fish's attack and improve the survival rate of the baby fish. Perfect isolator for aggressive fish, injured fish, small fish, shrimp and other marine fishes. Fishes such as Guppies, Tetras, Platties, Damsel, Clownfish and other small fishes about 1 inch may fit in. Self-floating & adherent design; double layers space-saving combination. Upgraded design & side vents allow for optimum water flow. Authentic quality & professional manufacturer support from Petzilla only. For a larger one, search Petzilla PBI-2 or PBI-3.