Fluval / Breeding Tanks

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

Name: Fluval Multi-Chamber Holding and Breeding Box Large Up To 3 Separate Housing Compartments
Brand: Fluval
SKU: JC2144
Price: 31.99 USD
Rating: 4.3 (6091 reviews)

★ 4.3 · 6,091 ratings

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$31.99

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Selected option: Fluval Multi-Chamber Holding and Breeding Box Large Up To 3 Separate Housing Compartments
SKU: JC2144

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Source specifications

Brand: Fluval
Material: Acrylic
Tank Volume: 1.9 Liters
Special Feature: Lightweight
Product Dimensions: 10.7"L x 5.7"W x 5.8"H
Item Weight: 1.2 Pounds
Shape: Rectangular
Specific Uses For Product: Indoor
Style: Modern
Color: Clear
Manufacturer: Rolf C. Hagen (USA) Corp.
ASIN: B005QRDCP2
Item model number: 10943
Customer Reviews: 4.3 4.3 out of 5 stars (6,091) 4.3 out of 5 stars
Date First Available: September 21, 2011
Item Package Dimensions L x W x H: 11.5 x 6.26 x 5.39 inches
Item Dimensions LxWxH: 10.7 x 5.7 x 5.8 inches
Brand Name: Fluval
Target Audience Keyword: fish, fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails
Directions: Follow individual packaging instructions.
Model Name: Fluval Multi-Chamber Holding and Breeding Box, Large
Size: Large
Age Range Description: All Life Stages
Number of Items: 1
Included Components: All items listed in description.
Specific Uses for Product: Indoor
Is Discontinued By Manufacturer: ‎ No
Product Dimensions: ‎ 10.7 x 5.7 x 5.8 inches; 1.2 Pounds
Best Sellers Rank: #8,683 in Pet Supplies ( See Top 100 in Pet Supplies ) #2 in Fish Breeding Tanks

The details

About this item

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. 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″ Rated 4.3 out of 5. Customers find the breeder box works well, particularly with fry separators and sneaky filter setups, and appre

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.

Product information

Materials and care

Material: Acrylic

From the manufacturer

Product details and media

Highlights: 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.

Key details: Item Weight: 1.2 Pounds | Customer Reviews: 4.3 4.3 out of 5 stars (6,091) 4.3 out of 5 stars | Item Package Dimensions L x W x H: 11.5 x 6.26 x 5.39 inches | Item Dimensions LxWxH: 10.7 x 5.7 x 5.8 inches | Brand Name: Fluval | Target Audience Keyword: fish, fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails | Directions: Follow individual packaging instructions. | Model Name: Fluval Multi-Chamber Holding and Breeding Box, Large | Color: Clear | Size: Large

How it fits your day: Use the key specs and highlights above to match it to your setup, space, or routine before you check out.

Customer feedback: 4.3/5 average rating.

Customers say: Customers find the breeder box works well, particularly with fry separators and sneaky filter setups, and appreciate its quality and ease of assembly, noting it's very easy to connect to tanks.

Review snippets: 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 / I love this little box for my pregnant shrimp! It easily fits onto my 75 gallon aquarium. I currently have 5 pregnant shrimp in here. They seem to have plenty of room, for now. I’m not how this will work

From the manufacturer Fluval Multi-Chamber Holding & Breeding Box Designed for breeding, isolating or acclimatizing fish or shrimp, the Fluval Multi-Chamber Holding & Breeding Box is a safe & secure nursery for livebearer fish that hangs on the outside of the aquarium to make viewing and maintenance easy. Warm, oxygenated water from main aquarium circulates continuously through the breeding box with the use of an air pump (sold separately), so that fish enjoy the same conditions as the aquarium. Additional heaters or filters not required. Multi-Purpose Safe & secure tank for breeding, isolating or acclimatizing fish or shrimp Space-saving design, easily installs on the exterior of the aquarium Up to 3 separate compartments for breeding, isolating or acclimatizing fish, using partition plates (included) For frameless aquariums use with min. 5 mm glass thickness See More

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Customer feedback

Customer ratings

4.3 out of 5

6,091 ratings

Customers find the breeder box works well, particularly with fry separators and sneaky filter setups, and appreciate its quality and ease of assembly, noting it's very easy to connect to tanks.

Kim

5.0 out of 5 stars Great Breeder Box for Raising Fry

Rating: 5

September 25, 2025

Verified purchase

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. Read more

Cassandra G

5.0 out of 5 stars Easy to set up! Fits 75 gallon tank! Plenty of inflow & outflow!

Rating: 5

September 20, 2025

Verified purchase

I love this little box for my pregnant shrimp! It easily fits onto my 75 gallon aquarium. I currently have 5 pregnant shrimp in here. They seem to have plenty of room, for now. I’m not how this will work or if I’ll be able to save babies. I’m certainly going to try. The box was super easy to set up. It only took a few minutes. I was worried because the directions said the aquarium water level had to be within 2” of the top. Mine is not. I have it lower than that. Thankfully, it works just fine. I get a steady stream of water pumping in and flowing out. I think this little box is genius! I’ll probably use it to house some plants or maybe other fish babies, in the future. Also, I wrapped a little quilt batting around the output to prevent anything from getting dumped back into the aquarium. Read more

Morgan Shafer

4.0 out of 5 stars Good product

Rating: 4

December 7, 2025

Verified purchase

Came with one of dividers tab broke Read more

T-Jay

5.0 out of 5 stars Don't put your flow too high. Use the correct angle.

Rating: 5

August 4, 2025

Verified purchase

The media could not be loaded. 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. Read more

Haley Hodges

5.0 out of 5 stars This worked very well

Rating: 5

March 9, 2026

Verified purchase

This worked very well Read more

Tess Gonzales

5.0 out of 5 stars Perfect breeding box that'll save them all.

Rating: 5

March 11, 2026

Verified purchase

Since my crayfish seem to breed quite often, I decided to get this box so the babies don't get eaten. The breeding box is quite sturdy and durable. The suction does a good job of holding the tube for water. The assembly was easy. A little noise is made when water is pushed into the box using air. It is just the right size for lots and lots of baby crayfish. Read more

Emilio Juliano

3.0 out of 5 stars Not good for newly hatched fry

Rating: 3

February 25, 2026

Verified purchase

Not good for trying to hatch out egglayer eggs. Slats in dividers and gates are spaced to far apart allowing baby fry to escape into next chamber and out the box and into tank. Also, it's very noisy if you have water intake turned up all the way. Also, water flowing into breeder box has debris from fish tank. Read more

Johnathon Ezzell

4.0 out of 5 stars Large Fluval Multi Camber Tank/Breeding Box Review Feb 2026

Rating: 4

February 26, 2026

Verified purchase

Used the Fluval Multi Chamber Box (large) for a separation tank due to one of our fish needing some rehab/alone time. Tank is easy to install - literally you just pop it on the rim of the tank - and we made sure we double checked measurements pre ordering. Water flows in and then out of the lower exit "slide" easily and there is a cover with a hole so you can feed your fish. Came with the dividers (we haven't needed to use these yet). The aeration IS loud if you have the valve on high (and some fish/medical treatments etc require high aeration). One of the adjustments we'll make is the entrance tube for the aeration doesn't go into the tank (it sits right above the surface) so you get loud gurgling noises and upper vibration of the water vs air bubbles in the water like a aeration stone. We'll add an attachment so it's under the water making it quieter and circulating a bit better. Ultimately a good purchase and we've used it no problem. *Will use this for plants after fish has rehabbed so tank will continue to get used in the long run. Read more

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    "ASIN": "B005QRDCP2",
    "Item model number": "10943",
    "Customer Reviews": "4.3 4.3 out of 5 stars (6,091) 4.3 out of 5 stars",
    "Date First Available": "September 21, 2011",
    "Item Package Dimensions L x W x H": "11.5 x 6.26 x 5.39 inches",
    "Item Dimensions LxWxH": "10.7 x 5.7 x 5.8 inches",
    "Brand Name": "Fluval",
    "Target Audience Keyword": "fish, fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails",
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    "Size": "Large",
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    "Number of Items": "1",
    "Style": "Modern",
    "Included Components": "All items listed in description.",
    "Specific Uses for Product": "Indoor",
    "Is Discontinued By Manufacturer": "‎ No",
    "Product Dimensions": "‎ 10.7 x 5.7 x 5.8 inches; 1.2 Pounds",
    "Best Sellers Rank": "#8,683 in Pet Supplies ( See Top 100 in Pet Supplies ) #2 in Fish Breeding Tanks"
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  "reviews": {
    "average_rating": 4.3,
    "customers_say": "Customers find the breeder box works well, particularly with fry separators and sneaky filter setups, and appreciate its quality and ease of assembly, noting it's very easy to connect to tanks.",
    "items": [
      {
        "title": "5.0 out of 5 stars Great Breeder Box for Raising Fry",
        "body": "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. Read more",
        "author": "Kim",
        "rating": 5,
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      {
        "title": "5.0 out of 5 stars Easy to set up! Fits 75 gallon tank! Plenty of inflow & outflow!",
        "body": "I love this little box for my pregnant shrimp! It easily fits onto my 75 gallon aquarium. I currently have 5 pregnant shrimp in here. They seem to have plenty of room, for now. I’m not how this will work or if I’ll be able to save babies. I’m certainly going to try. The box was super easy to set up. It only took a few minutes. I was worried because the directions said the aquarium water level had to be within 2” of the top. Mine is not. I have it lower than that. Thankfully, it works just fine. I get a steady stream of water pumping in and flowing out. I think this little box is genius! I’ll probably use it to house some plants or maybe other fish babies, in the future. Also, I wrapped a little quilt batting around the output to prevent anything from getting dumped back into the aquarium. Read more",
        "author": "Cassandra G",
        "rating": 5,
        "date": "September 20, 2025",
        "verified": true,
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      },
      {
        "title": "4.0 out of 5 stars Good product",
        "body": "Came with one of dividers tab broke Read more",
        "author": "Morgan Shafer",
        "rating": 4,
        "date": "December 7, 2025",
        "verified": true,
        "images": []
      },
      {
        "title": "5.0 out of 5 stars Don't put your flow too high. Use the correct angle.",
        "body": "The media could not be loaded. 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. Read more",
        "author": "T-Jay",
        "rating": 5,
        "date": "August 4, 2025",
        "verified": true,
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      },
      {
        "title": "5.0 out of 5 stars This worked very well",
        "body": "This worked very well Read more",
        "author": "Haley Hodges",
        "rating": 5,
        "date": "March 9, 2026",
        "verified": true,
        "images": []
      },
      {
        "title": "5.0 out of 5 stars Perfect breeding box that'll save them all.",
        "body": "Since my crayfish seem to breed quite often, I decided to get this box so the babies don't get eaten. The breeding box is quite sturdy and durable. The suction does a good job of holding the tube for water. The assembly was easy. A little noise is made when water is pushed into the box using air. It is just the right size for lots and lots of baby crayfish. Read more",
        "author": "Tess Gonzales",
        "rating": 5,
        "date": "March 11, 2026",
        "verified": true,
        "images": []
      },
      {
        "title": "3.0 out of 5 stars Not good for newly hatched fry",
        "body": "Not good for trying to hatch out egglayer eggs. Slats in dividers and gates are spaced to far apart allowing baby fry to escape into next chamber and out the box and into tank. Also, it's very noisy if you have water intake turned up all the way. Also, water flowing into breeder box has debris from fish tank. Read more",
        "author": "Emilio Juliano",
        "rating": 3,
        "date": "February 25, 2026",
        "verified": true,
        "images": []
      },
      {
        "title": "4.0 out of 5 stars Large Fluval Multi Camber Tank/Breeding Box Review Feb 2026",
        "body": "Used the Fluval Multi Chamber Box (large) for a separation tank due to one of our fish needing some rehab/alone time. Tank is easy to install - literally you just pop it on the rim of the tank - and we made sure we double checked measurements pre ordering. Water flows in and then out of the lower exit \"slide\" easily and there is a cover with a hole so you can feed your fish. Came with the dividers (we haven't needed to use these yet). The aeration IS loud if you have the valve on high (and some fish/medical treatments etc require high aeration). One of the adjustments we'll make is the entrance tube for the aeration doesn't go into the tank (it sits right above the surface) so you get loud gurgling noises and upper vibration of the water vs air bubbles in the water like a aeration stone. We'll add an attachment so it's under the water making it quieter and circulating a bit better. Ultimately a good purchase and we've used it no problem. *Will use this for plants after fish has rehabbed so tank will continue to get used in the long run. Read more",
        "author": "Johnathon Ezzell",
        "rating": 4,
        "date": "February 26, 2026",
        "verified": true,
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  "short_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.",
  "about_this_item": "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. 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″ Rated 4.3 out of 5. Customers find the breeder box works well, particularly with fry separators and sneaky filter setups, and appre",
  "long_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.\n\nHighlights: 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.\n\nKey details: Item Weight: 1.2 Pounds | Customer Reviews: 4.3 4.3 out of 5 stars (6,091) 4.3 out of 5 stars | Item Package Dimensions L x W x H: 11.5 x 6.26 x 5.39 inches | Item Dimensions LxWxH: 10.7 x 5.7 x 5.8 inches | Brand Name: Fluval | Target Audience Keyword: fish, fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails | Directions: Follow individual packaging instructions. | Model Name: Fluval Multi-Chamber Holding and Breeding Box, Large | Color: Clear | Size: Large\n\nHow it fits your day: Use the key specs and highlights above to match it to your setup, space, or routine before you check out.\n\nCustomer feedback: 4.3/5 average rating.\n\nCustomers say: Customers find the breeder box works well, particularly with fry separators and sneaky filter setups, and appreciate its quality and ease of assembly, noting it's very easy to connect to tanks.\n\nReview snippets: 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 / I love this little box for my pregnant shrimp! It easily fits onto my 75 gallon aquarium. I currently have 5 pregnant shrimp in here. They seem to have plenty of room, for now. I’m not how this will work\n\nFrom the manufacturer Fluval Multi-Chamber Holding & Breeding Box Designed for breeding, isolating or acclimatizing fish or shrimp, the Fluval Multi-Chamber Holding & Breeding Box is a safe & secure nursery for livebearer fish that hangs on the outside of the aquarium to make viewing and maintenance easy. Warm, oxygenated water from main aquarium circulates continuously through the breeding box with the use of an air pump (sold separately), so that fish enjoy the same conditions as the aquarium. Additional heaters or filters not required. Multi-Purpose Safe & secure tank for breeding, isolating or acclimatizing fish or shrimp Space-saving design, easily installs on the exterior of the aquarium Up to 3 separate compartments for breeding, isolating or acclimatizing fish, using partition plates (included) For frameless aquariums use with min. 5 mm glass thickness See More",
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      "text": "Highlights: 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."
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