The Boyu FH-102 Breeding Box is a floating isolation chamber with dual compartments, ideal for separating fry, injured fish, or aggressive species. Its transparent design and secure mounting system make it perfect for breeding and quarantine in freshwater and marine aquariums. This Fish Hatchery Is Perfect For Protecting Fry Born Inside Your Aquarium By Safely Separating Them From Other Aggressive Fish. The Hatchery Has Two Layers Which Are Specifically Designed For Use With Pregnant Fish. You Are Able To Place These Fish Inside The Top Layer Of The Hatchery And Once They Have Given Birth, The Eggs Will Filter Through The Holes In This Layer And Are Automatically Quarantined From Their Mother. The Fry Can Then Mature Until It Is Safe To Release Them Into Your Tank Fully. An Added Feature Of This Hatchery Is That You Can Isolate Sick Fish Or Fish That Are Getting Bullied By Other Fish And Yet Keep Them In The Same Water.