Enhanced postnatal support Provides a secure environment for the mother fish after birth. Isolates the mother for one to two days, enabling separate care of sick and young fish. Multi-layer fry protection Multi-layer design reduces the chance of fry returning or escaping, boosts survival rates, and prevents predation. The breeder box offers a secure growth environment with a meticulously designed honeycomb interior and fine-hole baffles. Improved water oxygenation 0.7 mm fine water-permeable grooves and water inlets from all sides enhance oxygen content and ensure good water circulation, effectively reducing hypoxia. Effortless supervision Transparent construction with a high-definition observation window lets you monitor activity and well-being without disturbance. Practical use scenarios - Postnatal care in a new fry batch: use after birth to isolate the mother for 1-2 days, while fry and sick fish are kept separate for safe early care in the same system. - Fry and tank mate protection: place in the breeder box to minimize predation and interference from other fish during early fry development. - Quarantine and observation: keep sick or weak fry visible for targeted care and regular monitoring without disruption. This description preserves the original functions and features while presenting clear benefits, readable structure, and practical scenarios.