---
product_id: 3624126
title: "Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments"
brand: "fluval"
price: "£32.86"
currency: GBP
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.co.uk/products/3624126-fluval-multi-chamber-holding-and-breeding-box-large-up-to
store_origin: GB
region: United Kingdom
---

# Uses aquarium’s own water circulation Fits aquariums up to 1” glass thickness 3 separate compartments Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments

**Brand:** fluval
**Price:** £32.86
**Availability:** ✅ In Stock

## Summary

> 🐠 Elevate your aquatic game with precision breeding & quarantine mastery!

## Quick Answers

- **What is this?** Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments by fluval
- **How much does it cost?** £32.86 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/3624126-fluval-multi-chamber-holding-and-breeding-box-large-up-to)

## Best For

- fluval enthusiasts

## Why This Product

- Trusted fluval brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Natural Water Flow:** Utilizes your aquarium’s existing water circulation—no extra heater or filter needed, ensuring stable conditions.
- • **Compact Yet Spacious:** Holds 1.9 liters (0.5 US Gal) in a sleek 10.7” x 5.7” x 5.8” design—perfect for professional setups with limited space.
- • **Triple-Chamber Control:** Up to 3 separate compartments for breeding, quarantine, or acclimation—maximize your tank’s potential.
- • **Versatile & Lightweight:** Ideal for fresh or saltwater tanks, lightweight acrylic construction for easy handling and maintenance.
- • **Seamless Aquarium Integration:** Easily attaches to most aquariums up to 1” thick, saving tank space while keeping fish visible and safe.

## Overview

The Fluval Multi-Chamber Holding and Breeding Box is a sleek, acrylic aquarium accessory designed to provide up to three separate compartments for breeding, isolating, or acclimating fish. Compatible with most aquariums up to 1” thick, it leverages your tank’s existing water flow to maintain optimal conditions without extra equipment. Its compact, space-saving design holds 1.9 liters of water, making it perfect for professional aquarists seeking efficient, visible, and safe fish management.

## Description

The Fluval Multi-Chamber Holding and Breeding Box is ideal for those looking for a convenient way to separate fish from the tank. This is usually done during breeding and as a maturation tank for young fry; but there are other times when fish may need to be isolated. This box does this without taking up space in the tank. Keeping perfect aquatic harmony has never been easier.

Review: Great Breeder Box for Raising Fry - This breeder box has been perfect for raising my celestial pearl danio fry. It was easy to assemble, and I really appreciate how simple it is to access the inside for both feeding and cleaning. I did make a small modification by adding a sponge to the return since the provided grates were a bit too large and could allow fry to slip through. With that adjustment, it works wonderfully. Overall, I highly recommend this breeder box for anyone raising fry.
Review: Don't put your flow too high. Use the correct angle. - So as you see in my video I have experience with the small, and now I own the large version of this breeder box. It works great. Some reviews say people had issues. As you see, it doesn't leak and the pegs didn't break off like some others said. The pegs add and remove leverage so that it can sit correctly. You want it to be aligned perpendicular with the rim of your tank or if anything SLIGHTLY angled downward INTO the tank. You do not want the bottom of the breeder box to be pushed out from the tank. I could see that as a reason why the pegs would break for some people. You don't want the bottom too far in. I could see that causing the box to leak from the front but I dont see how that could ruin your marriage. I have my pegs on number 4 but the glass and rim is thick on my 75 gallon. Front of the breeder box should be more or less parallel with the tank. Don't put your flow too high. I have a constant drip. Maybe 1 to 4 drops per second but it needs to be dripping into the box constantly. It gives a small stream from the slit and a constant drip into the aquarium. It doesn't make lots of noise. I haven't had issues with this method in 2 years. This combined with my egg incubator is invaluable when it comes to preserving numbers. The small version does not have a lock. I don't use the lock on the big one. I dont like the design of it. I didn't need instructions because I'm not incompetent but some people may need them.

## Features

- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005QRDCP2 |
| Additional Features | Lightweight |
| Best Sellers Rank | #11,304 in Pet Supplies ( See Top 100 in Pet Supplies ) #2 in Fish Breeding Tanks |
| Brand | Fluval |
| Brand Name | Fluval |
| Color | Clear |
| Customer Reviews | 4.4 out of 5 stars 6,197 Reviews |
| Global Trade Identification Number | 00015561109437 |
| Included Components | All items listed in description. |
| Item Dimensions L x W x H | 10.7"L x 5.7"W x 5.8"H |
| Item Shape | Rectangular |
| Item Type Name | Aquarium Fish Breeding Box |
| Item Weight | 483 Grams |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer Part Number | 10943 |
| Material | Acrylic |
| Material Type | Acrylic |
| Model Number | 10943 |
| Pet Type | Fish |
| Product Dimensions | 10.7"L x 5.7"W x 5.8"H |
| Product Style | Modern |
| Special Feature | Lightweight |
| Specific Uses For Product | Indoor |
| Tank Volume | 1.9 Liters |
| Target Species | Fish |
| UPC | 740023371861 015561109437 |
| Unit Count | 1 Count |
| Vivarium Type | Fish Breeding Tank |

## Product Details

- **Brand:** Fluval
- **Color:** Clear
- **Item Weight:** 1.2 Pounds
- **Material:** Acrylic
- **Product Dimensions:** 10.7"L x 5.7"W x 5.8"H
- **Shape:** Rectangular
- **Special Feature:** Lightweight
- **Specific Uses For Product:** Indoor
- **Style:** Modern
- **Tank Volume:** 1.9 Liters

## Images

![Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments - Image 1](https://m.media-amazon.com/images/I/61HRvKlIj-L.jpg)

## Available Options

This product comes in different **Customer Package Type, Size** options.

## Questions & Answers

**Q: What are the dimensions of the box?**
A: 6.5"L x 5"H x 3.5"W.  If you include the part that hangs on to the tank the width is 5".  You can only fill water up to a height of 4" before the water spills back into the tank in the overflow channel.

**Q: how do I separate mama guppy and babies? it seems different with the medium size breeding box and I am so confused how it works...**
A: Apparently the sizes are not being represented correctly by Amazon. The small through medium versions are actual breeder boxes where pregnant female can give birth and the fry it seperate by a v birth gravity fed system to seperate the fry from the mom. The large breeding box can be used as isolation fry raising rearing or to breed fish in it in a confined space where males can fertilize the females. The large comes with 2 dividers to create 3 seperate housing area to grow out fry. I was Lao misled about this thinking all the sizes were the same but small and medium are one type and large is used as an external isolation tank. Hope this helps future buyers. I know amazon gets picky when you return things and has threatened to close my account over it but when a big company like this doesn't know the product it's actually selling and groups it together with all sizes it will create confusion to the consumer and in turn we get penalized for it or may have to pay return shipping. Those return shipping fees are the price of this plastic so it's not worth it to return. Nice product but now I need to buy a medium also because it's really what I needed with a very birth chamber to seperate fry from being eaten. Sucks wasted money.

**Q: What's to stop the fry from washing into the main tank with the returning water?**
A: You must place a piece of sponge on the intake and in front of the grate of the water return to guarantee the safety of the fry.

**Q: Can mollies fit in the small breeder box**
A: yes they can, not many of them though. we kept our fish in their regular tank and once the female mollies were pregnant we moved the pregnant ones to the breeder box only about 2-3 of them. It is pretty small.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Breeder Box for Raising Fry
*by K***M on September 25, 2025*

This breeder box has been perfect for raising my celestial pearl danio fry. It was easy to assemble, and I really appreciate how simple it is to access the inside for both feeding and cleaning. I did make a small modification by adding a sponge to the return since the provided grates were a bit too large and could allow fry to slip through. With that adjustment, it works wonderfully. Overall, I highly recommend this breeder box for anyone raising fry.

### ⭐⭐⭐⭐⭐ Don't put your flow too high. Use the correct angle.
*by T***Y on August 4, 2025*

So as you see in my video I have experience with the small, and now I own the large version of this breeder box. It works great. Some reviews say people had issues. As you see, it doesn't leak and the pegs didn't break off like some others said. The pegs add and remove leverage so that it can sit correctly. You want it to be aligned perpendicular with the rim of your tank or if anything SLIGHTLY angled downward INTO the tank. You do not want the bottom of the breeder box to be pushed out from the tank. I could see that as a reason why the pegs would break for some people. You don't want the bottom too far in. I could see that causing the box to leak from the front but I dont see how that could ruin your marriage. I have my pegs on number 4 but the glass and rim is thick on my 75 gallon. Front of the breeder box should be more or less parallel with the tank. Don't put your flow too high. I have a constant drip. Maybe 1 to 4 drops per second but it needs to be dripping into the box constantly. It gives a small stream from the slit and a constant drip into the aquarium. It doesn't make lots of noise. I haven't had issues with this method in 2 years. This combined with my egg incubator is invaluable when it comes to preserving numbers. The small version does not have a lock. I don't use the lock on the big one. I dont like the design of it. I didn't need instructions because I'm not incompetent but some people may need them.

### ⭐⭐⭐⭐ Great, if you fix the sputtering
*by A***S on October 9, 2017*

Are you like me where bubbling water doesn't bother you but sputtering water and splashing does? I ask this because if you follow the instructions of this breeding box you'll hear loud, obnoxious sputtering. I'm not quite sure why it sputters the way it does, but it was driving me crazy. So this is what I did. In the instructions, you'll see two parts, Intake Tube (9) and Discharge Cap (8). Follow the instructions in putting the breeding box together, but then do the following if the sputtering noise bothers you like it did me. Throw out the Discharge cap. Feed a three inch or so piece of airline tubing into the top part of the Intake Tube where the Discharge cap would normally be affixed. Just feed it enough to be secure. Place the other end of the airline tubing into the water of the breeding box. You'll get bubbling instead of sputtering, which for me is realms more tolerable. Other than that this is a great little box. I use it as a half semi filter, half moss and shrimp storage. Edit: By the way, when you make the fix above, make sure the airline tubing you use isn't too long. Too long and the water struggles to make it up U turn of the Intake Tube, which causes it to act like just an airpump, instead of pulling water from the main tank in. If this happens and you don't realize it can be quite bad. For instance, if your house is cold and your tank warm, the pump won't bring the warm water from the main tank into the breeding box, so the temperature will drop heavily. That's bad. You'll also be dealing with only the water volume of the box instead of the water volume of the whole tank, which is also bad. So say you have this breeder box on a 10 or a 20 gallon, and you fix it incorrectly so that it's only bringing air into the box, then you've only got the water quality of the box, which is tiny. So make sure that both water is making it into the box and that water is exiting the box through the overflow (it should at least drip constantly).

## Frequently Bought Together

- Fluval Multi-Chamber Holding and Breeding Box, Large – Up To 3 Separate Housing Compartments
- Ultra Fresh Baby Fish Food with 50% Sword Prawn Shrimp, Slow Sinking, Substitute for Brine Shrimp - For Fry Health and Cleaner Water
- Tiny Fry Fish Food 1.76 oz, Fine Powder for Newborn Aquarium Fish

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-14*