The Boyu NB-3201 Breeding Net (15 cm) is a compact, mesh enclosure ideal for isolating fry, injured fish, or aggressive species. It provides a safe and breathable space within the aquarium, promoting healthy development and stress-free separation. Safely Separates New- Born Fry From Mother And Other Fish Or Isolates Injured Or Aggressive Fish. New Frame Style With Removable, Locking Legs. Insert 4 Columns To 4 Corners Of To Jack Up The Frame And Put The Net From The Top To The Bottom To Sheathe The Frame. Adjust The Position Of The Net Breeder To Make Sure The Water Level Is Not Above The Top Frame.