The Fluval Hang-On Breeding Box Large is designed to easily attach to the side of most aquariums with a thickness of up to 1". This versatile multi-chamber box offers up to three individual compartments to safeguard fry, unwell or fragile fish, or newcomers needing acclimation to their new environment. Highlights: Adaptable breeding box with options for 1, 2, or 3 separate sections Perfect as a nursery or incubator to shield newborn fry from predators, boosting their chances of survival Offers a secure refuge for fish that are injured or weakened Assists in acclimating new fish by allowing aquarium water to flow through the box Conveniently hangs on the outside of the aquarium for easy monitoring and upkeep Compact dimensions of 10.25" L x 5.5" W x 4.75" H (26 x 14 x 12 cm), with a capacity of 0.5 US Gal (1.9 L) Suitable for frameless tanks with glass thickness of 0.25-0.4" (5-10 mm) and framed tanks under 1 ¾" (47 mm) Requires a separate Air Pump (1L/min - A849) and Airline Tubing (A1141) for operation Uses the same conditioned water as the main tank, eliminating the need for an extra heater or filter Compatible with both freshwater and marine aquariums Contents: Breeding box with protective lid Intake pipe 3 x Dividing panels 2 x Level adjusters Air control valve 12" (30 cm) airline tubing Outlet cap Intake extender Sealing O-Ring Filter strainer Lid fasteners 2 x Water discharge slit plates (1 for thick frames with 3 bars, 1 for thin frames with 5 bars) 2 x Mounts for frameless aquariums