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Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments



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  • Compatible with Most Aquariums: Easily attaching to the side of most aquariums up to 1” thick, the Multi-Chamber Holding & Breeding Box provides up to 3 separate compartments for protecting fry, sick/weak fish or new fish that require acclimation.
  • Required Parts: Please note that this multi-chamber will require an Air Pump (1 L/per minute) and Airline Tubing, both of which are sold separately.
  • Usage: Ideal as a hatchery and incubator to help protect newborn fry from being eaten (which improves survival rate). Provides a safe haven for injured or weak fish. Helps acclimate new fish as water circulates from the aquarium
  • Space-Saving: This chamber’s design measures 10.25″ L x 5.5″ W x 4.75″ H (26 x 14 x 12 cm) and holds 0.5 US Gal (1.9 L) of water. Hangs onto aquarium exterior for easily observing fish and convenient maintenance.
  • Versatile: Utilizes the same conditioned water as your aquarium, no additional heater or filter required. Can be used with fresh and saltwater aquariums.

Specification: Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments

Item Weight

1.2 Pounds


Rolf C. Hagen (USA) Corp.

Item model number


Date First Available

September 21, 2011

Item Package Dimensions L x W x H

10.55 x 5.91 x 5.39 inches

Item Dimensions LxWxH

5.8 x 10.7 x 5.7 inches

Brand Name


Target Audience Keyword

fish;algae-eaters, betta-fish, bottom-feeder-fish, cichlid-fish, goldfish, invertebrate-fish, mollusks, octopuses, rays, sharks, snails, fish


Follow individual packaging instructions.

Model Name

Fluval Multi-Chamber Holding and Breeding Box, Large





Age Range Description

All Life Stages

Number of Items




Included Components

All items listed in description.

Specific Uses for Product


5 reviews for Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments

4.8 out of 5
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  1. Review Guy

    Bought this to temporarily house babies for my cichlid tank until they were large enough to safely go in the grow-out setup – worked pretty nice, though I think it’ll be better suited for smaller fish such as guppies. Will have to test that out with my upcoming guppy breeding tank and see if the fry can fit through gaps in the plastic dividers. Also useful for separating fish if you have one getting beat up that needs its own space to recover.

    Wasn’t too hard to set up and is sturdy once you get it together. The bubbler does make a little noise, but it isn’t terribly noticeable imo. The flow isn’t heavy enough to push the fry around but disturbs the surface enough to help aerate the water.

    Only downside I’ve come across is that the gap between the lid and tank along the lip that hangs it off the main tank is large enough for slimmer fish to jump out; was keeping a 3″ khuli loach in there for a moment while cleaning out his old tank and he spooked and jumped right into the other tank! Happened so quick that I needed a moment to figure out why my loach suddenly wasn’t there, lol. Now I keep a little bit of paper towel over that spot and haven’t had a problem since.

    That aside, I’m very happy with my purchase and will definitely make further use of it in the future.

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  2. Review Guy

    Easy to assemble, good quality.

    My Betta was being aggressive and I have to get a makeshift tank ready while I setup a new 10gal.

    Very sturdy and was able to hang on my 3gal tank. Without issues.

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  3. E. M. Fraise

    Fits the small side of my 10g mixed reef tank perfectly, holds macroalgae an pods, with just enough flow coming through the valve to allow a small stream of water through the “return” into my tank

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  4. E. M. Fraise

    I’m so glad i found this! We have 2 set up to temporarily house axolotl larvae. It keeps the water chilled, filtered, and aerated, cycling directly from the main tank. I’ve set a thin piece of filter sponge inside the exit stream at the surface to keep babies from escaping – the current isn’t strong enough for them to get trapped (1″ opening x 1/8″ water depth). I especially like that it doesn’t require a bunch more maintenance or take any space away within the existing tank. It’s versatile, and can be used whenever fish/lotls need to be isolated or acclimated.

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  5. h0MbrE

    I bought one of these for my angelfish breeding. I have some pairs that throw a percentage of albino fry and could never manage to get any of the albinos to survive until I tried one of these breeding boxes. Now, I am getting unbelievably high survival rates with my albino fry! I now have three of these and a fourth one is on it’s way! And they are very affordable.

    I can’t say enough good about these boxes. They really simplify raising fry. They are VERY easy to clean and maintain. They can be used not only as breeding/fry boxes, but also as slow-drip acclamation devices, isolation tanks for stressed or “bullied” fish, and great holding tanks for taking pictures of your fish, and the added benefit of having the stability of the larger tank that the box is hanging on is priceless. To do a water change for your fry, simply do a water change in the main tank, and you never even have to move the fish in the box or worry about them during water changes.

    As I mentioned already the price is fair, not too expensive at all. The instructions were simple and the design is brilliant.

    The only cons I guess I can think of are that you can’t use a top for the tank they are hanging on unless you devise a custom top that can fit around the part that hangs over the front of the tank. The other thing is that they come with tow “grates” that cover the overflow, one with small gaps for smaller fry, and one with larger gaps for once the fry are grown out a little. The problem with the grate covers with angelfish is that even with the smaller gapped grate, fry can squeeze through and get washed back into the main tank. To remedy this I bought some foam sponge from hobby lobby and cut small squares to replace the grate for the first week or so until the fry are too big to fit through the gaps. You will want to cut the foam sponge pieces to fit snugly but not tightly enough to restrict too much water flow otherwise you can overflow the box and wash some fry back into the tank that way. With a little adjusting of the trickle and just the right size sponge block, you can keep the fry in the box no problem. As great as these are I can’t justify taking away a star for that little issue. If it weren’t for these breeder boxes I wouldn’t be able to raise the albinos… at least not without quitting my job and tending to them full time!

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    Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments
    Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments


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