Fiji Cube

Fiji-20 Advanced Reef Sump - 2nd Gen

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Fiji Cube sumps are characterized by truly unique design features and a clean, elegant design. When it comes to sumps, it they all operate on pretty similar designs and layouts, so choice can really come down to the fine details. Fiji Cube has incorporated some innovative and interesting features into their sumps that we think you'll really appreciate.


At the very start, you'll notice the interchangeable filter sock holder or filter floss tray, providing extra versatility in mechanical filtration. One feature we really like is the built-in heater holder bracket in each sump, which takes the hassle and concern of proper heater mounting in the sump out of the equation. Of course, they also include plenty of room for equipment such as skimmers and reactors and as well as a refugium-ready design for larger sump sizes, so all modern sump needs are met. You'll also find a polycarbonate sump cover with a skimmer cutout included to reduce noise and evaporation, which is another unique trait that shows their attention to detail. Rounded corners, euro-bracing, probe holders and dosing tube holders round out the mainstays for a really well rounded sump design.



  • High quality full cast acrylic construction and full top support brace
  • Quiet water flow operation design
  • Interchangeable floss filter box and filter sock holder
  • Removable heater holder, test probe holder and dosing holes included
  • Removable auto-top-off float valve holder
  • Water level adjustable (5”-12”) in protein skimmer, refugium and equipment compartments
  • Polycarbonate sump cover / lid
  • Refugium ready



  • Recommended Tank Size: 60 gallons to 100 gallons
  • Overall Dimensions: 20"L x 15"W x 16"H
  • Skimmer Chamber: 14.2"L x 8.1"W
  • Refugium Section: 5.2"L x 5.8"W
  • Return Pump Section: 8.1"L x 5.8"W
  • Filter Sock Holders: 2x 4"
  • Drain Input Size: 2x 1"


What's Included?

  • Fiji Cube Fiji-20 Advanced Reef Sump, 2nd Generation
  • Removable Heater Holder Bracket, Probe Holder Bracket, and Dosing Tube Bracket
  • Polycarbonate Sump Cover
More Information
UPC 761856629554
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Product Questions

How many gallons it holds?
Question by: Humberto Estrada on Jul 24, 2022, 6:23 AM
Hey there,
Thank you for reaching out to us. This will hold 20-gallons of water.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Jul 25, 2022, 9:05 AM
Does the sump include the 2 filter socks?
Question by: Clint on Nov 27, 2021, 9:15 PM
Hello, filter socks are not included. Thanks.
Answer by: Christian (BRS Staff) on Nov 28, 2021, 12:09 PM
What else would I need to hook it up? I currently have an HOB skimmer.
Question by: Tammy on Nov 20, 2021, 3:01 PM
Hi, thanks for the question. You would need 1" PVC for the drain pipes, you can use one or two depending on your overflow box, a return pump and tubing for the return line and if the tank is not drilled you can use a Barbed Return Jet Nozzle. If you need more assistance plumbing your sump or picking a return pump, feel free to give us a call or email us and we will be more than happy to assist you further. Happy Reef Keeping.
Answer by: Christian (BRS Staff) on Nov 23, 2021, 11:41 AM