This breeding box for fish provides a floating space for bettas and newborn fry inside an aquarium. The anti-escape mesh helps keep small fish contained while allowing the box to remain positioned in the tank. Use it during breeding, fry separation, or short-term observation in a home aquarium. The floating design keeps the fish breeder box at the water surface, making it suitable for betta fish and other small aquarium fish. Compared with placing fry in an open container, the mesh-sided design helps create a defined area within the main aquarium. The PET plastic body is lightweight and easy to handle, while the 2-piece set supports separate use when needed. Rinse the box before placing it in the aquarium. Check the mesh and water flow regularly, remove any debris, and clean the box between uses. Place it where it can float freely without blocking aquarium equipment.