The FinyPetz Double Deck Aquarium Breeding Box is designed to safely isolate, breed, and protect baby fish inside your aquarium. Made from high-quality transparent acrylic, this fish fry isolation tank allows clear visibility while keeping newborn fish protected from adult fish aggression. Its double deck design helps separate fish efficiently for breeding, quarantine, or recovery purposes. The air pump connectable oxygen supply port ensures proper water circulation and oxygen flow, helping maintain a healthy environment for delicate fry and weak fish (air pump not included). Equipped with strong suction cups, the breeder box stays firmly attached to aquarium glass without slipping. The compact Medium size (14×8×14 cm) fits most home aquariums and is ideal for guppy, molly, betta fry, shrimp, and small ornamental fish. Whether used as a fish breeding box, isolation tank, quarantine box, or hatchery, this acrylic breeder box offers a safe and controlled space for baby fish growth and protection.