1,Premium Acrylic Material:The aquarium breeding box is made of clear, durable acrylic that's break-resistant and easy to clean, providing a safe, observable space for fish hatching, isolating, and rearing. 2,All-needed Accessories:The fish tank breeding box includes all the needed accessories: Hatching box*1 , Isolation Box *1, Coarse-hole Divider *1, Fine-hole Divider*1, Floating Foam Circle (inner)*1, Floating Foam Circle (outer)*1, Anti-Escape Lid (inner)*1, Anti-Escape Lid (outer)*1. 3,Unique Design:Equipped with a floating foam circle, the breeding box can float effortlessly on the water surface of the fish tank(The position of the floating foam circle should not be lower than half of the box, the box may tip over). The Dividers with holes allow free flow of water to keep oxygen levels up. 4,Easy to Use:Place the mother fish inside the hatching box. When the she gives birth, the baby fish can swim through the holes of the divider to the isolation box. Each of the box can also be used as a safe-house for sick fish or to segregate aggressive fish, you can use Anti-Escape Lid to prevent fish from escaping. 5,Versatile Use:The upper breeding box can be removed separately. It can also be stacked together with the isolation box for combined use. You can choose to combine the breeding box and the Isolation box or separate them as you .