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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

Is Discontinued By Manufacturer


Product Dimensions

5.8 x 10.7 x 5.7 inches, 1.2 Pounds

Item model number


Date First Available

September 21, 2011


Rolf C. Hagen (USA) Corp.

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

4.4 out of 5
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  1. Lou

    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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  2. C. Berry

    The media could not be loaded.

     I’m only using this as a temporary holding for my betta until I can put him in his upgrade (which will be tomorrow) and its pretty nice. You could definitely use this as a filter and use your own media if you wanted. You would definitely need a bigger air pump with more power to push out more water but could definitely work. The stability is good so far (but this is the first time I’m using it will update later down the road) The lid is nice I like that it clamps. There is no noise which is nice I also like how clear it is. I will say I had a hard time getting the tubing thru the little area where you can put it but with some tweezers I was able to jam it thru.

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  3. E. M. Fraise

    So handy for the fishkeeper. Isolate a stressed or problem fish. As a breeder box it works great for live bearers. Used it with platy and molly. Works great for small mouth brooding cichlids. Used it for electric yellow labs. Just a great way to keep the little fry from being eaten while they still share the same water as the parents. The only down side is you do have to be delicate with it as the plastic is fragile and will crack easily.

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  4. Lou

    I ordered this tank for my Bangaii Cardinal fish. Hangs perfectly on the side of my 100 gallon tank, allowing fresh water to enter and exit. Simple to set up, and works great. Highly recommend it. We’ll see how it works for growing out the fry.

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  5. E. M. Fraise

    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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    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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