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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. Mike A

    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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  2. Analise

    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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  3. Review Guy

    The media could not be loaded.

     This is an absolutely great box for the right uses, and I applaud Fluval for remembering air drive still exists! Note: video is wayyy louder than it really is – and that’s my Amazon tank so the water is supposed to be that color!

    This larger box has vertical dividers which could be configured to keep mating pairs apart until breeding time or to keep multiple fragile fish under observation and apart. They are removable though so you can pull them all and have a 1/2 gallon isolation/rearing tank too.

    The smaller 0.3 gallon has the typical V-divider you’d use for livebearers. This won’t work as well foe them because mom might eat them all before they find their way into the neighboring chamber.

    – The box is made of the typical clear plastic that you’ll find on these kinds of products – including breeder boxes from Lee’s. Treat it gently and it will hold up ok. Beat it up and you’ll be buying a new one.
    -Construction: Fluval included all the shims, grates, and small parts one might need for any kind of tank situation. It’s a fair criticism that the level adjusters are splined and not a cam like you’d find on an Aquaclear. DON’T try to turn them inserted or you’ll snap them. And DON’T shove them in all the way or it’ll be a tall order to pull them later. Just get them in a little snug.
    – Flow: I think a lot of negative reviews come from folks that are expecting a power filter. This isn’t. And you wouldn’t want that for these purposes. I love air drive for this kind of thing because it goes up in seconds and comes back down just as quick with no fiddly impeller to clean gunk from. I would love a larger bell-end that I could use an air stone with but that’s just me.
    – Noise: Yet another place I disagree with some negative comments. Air drive is about low and slow (especially with no air stone). You want to turn this down until it barely bubbles out – like watching a drip coffee maker. At that level you’ll get a continuous dribble from the outlets and it’ll be nice a quiet with or without the end cap. If you crank it up it’ll almost shoot water out the lid, but it’ll make a huge racket and most of what you’re getting is a tube full of air because you’ve left little room for water to be in there. I do this for a sec at the end of the video.
    This ain’t a stand alone aquarium – you aren’t trying to filter it with the flow. A continuous trickle of fresh water from the main tank is more than enough unless your room is dramatically colder than the tank.

    All in all I’m thrilled there’s a nice and affordable option beyond the little Lee’s bins that just float around on the surface.

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  4. 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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  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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