Hang-On Breeding Box (Medium)

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Fluval Hang-On Observation Box

  • Ideal For Observing New Corals Before Adding to the Aquarium
  • Provides a Safe Haven for corals being Picked on by Fish
  • Hangs on to Exterior of the Aquarium for Easy Observation


Easily attaching to the side of most aquariums, the Hang-On Observation Box provides an isolated area where you can easily observe the coral or invertebrates inside. Due to its size, most saltwater fish will be too large to be housed inside for an extended period of time. 

The box is air driven, so an air pump will be necessary for operation (sold separately). Fluval recommends a 1L/minute air pump. A valve to control the air flow is included. 


Max Glass Thickness: For use with rimless aquariums with a glass thickness of 0.25-0.4" and framed aquariums less than 1.75"

Dimensions: 6.5" L x 5" W x 4.75" H

Volume: 0.3 Gallons


What's Included?

Observation box with cover

Intake tube

V-Shape separator

Leveling adjuster

Air valve

Airline tube 12″ / 30 cm

Discharge cap

Intake extension



2 x Slit plates for discharging water (1 thick frame – 3 bars, 1 thin frame – 5 bars)

More Information
UPC 015561109420
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Product Questions

what air pump do you suggest for this breeder box? Mine are WAY too old to use....................
Question by: Judy Brown on Dec 30, 2023, 7:38 AM
Answer by: Grace (BRS Staff) on Jan 18, 2024, 12:15 PM