Unique floating and transparent plastic cover designed to prevent the fish out of the isolation room to protect the newborn fish. Anywhere convenient fixed in the tank,self-floating design with suction cup, 2-layer combination does not occupy space. Features: 1. Transparent acrylic material can observe the breeding of oviparous fish, prevent adult fish from attacking and increase the survival rate of larvae. 2. Perfect isolation for aggressive fish, injured fish, small fish, shrimp, clown fish, and other marine fishes. 3. Self-floating and wall-mounted design, the double layer combination does not take up space. 4. Prevent the baby fish from the adult fish's attack and improve the survival rate of the baby fish. 5. Multi-room designed - space can be divided into as much as 2 small 'rooms'As needed. 6. Upgraded design & side vents allow for optimum water flow. Specification: Condition: 100% brand new material: Acrylic weight: Approx. 112g Size:(approx) 12.5*7*7cm/4.92*2.75*2.75inch Package include: 1*fish breeding box Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.