Reef Octopus

Octo Reef Sump 24A

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Octo Reef Sumps offer attractive design, the versatility and features you need, and they’re built to last. Each Octo Reef sump is hand-built from solid acrylic for years of trouble-free service. They’ve got you covered with plenty of room for your skimmer and return pump, and they also feature a built-in ATO reservoir.



  • Reef Octopus red color accents (matches other Reef Octopus products)
  • Solid acrylic construction
  • Adjustable water depth from 5.1” to 9”
  • Dedicated protein skimmer (and/or reactor) chamber
  • Dedicated return pump chamber
  • Dedicated freshwater reservoir with lid for ATO
  • Bubble-diffusing intake chamber with lid
  • Built to accommodate roller filter mats like the Klir Filter Di-4


One of the standout features is actually the filter sock compartment. Of course, if you want to run standard 4 inch filter socks, you definitely can, but if you’re looking to upgrade to a lower-maintenance option like one of the new Klir rollermat filters, Octo Reef sumps have been designed with this in mind. The filter sock chamber has been built with an overflow designed for operation with the Klir DI-4 fleece filter system.


Another hobbyist-friendly feature is the ability to adjust the water level in the sump. All OCTO Sump models have the ability to adjust the water depth inside from 5.1” all the way up to 9”. This makes it super easy to set the right depth for your protein skimmer to perform optimally without the need to buy a separate stand to raise it.


Get it right the first time and go with an Octo Reef sump. Their meticulous craftsmanship and hobbyist-minded features ensure this will be a sump you can be proud of.



  • Dimensions: 23.62"L x 14.17"W x 15.75"L
  • Skimmer Section: 13.27"L x 9.45"W
  • Return Pump Section: 6.8"L x 7.2"W
  • ATO Volume: 3 gallons
  • Adjustable Water Level: 5.1" to 9"
  • Drain Input Fittings: 1
  • Drain Size: 1"
  • Filter Socks: 1
  • Filter Sock Size: 4"


More Information
UPC 6950291252050
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Product Questions

What size aquarium is this sump designed for?
Question by: Angela Easley on Jul 20, 2023, 1:25 PM
Hey there,
Thank you for reaching out to us. We recommend about 20% of tank volume for your sump, so this would work for a tank up to 100-gallons.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Aug 1, 2023, 7:52 AM
Does the reefmat 500 fit in the filter sock section of this model?
Question by: Bruce on May 20, 2022, 7:30 AM
Hey there,
Thank you for reaching out to us. It does not fit in that section of this sump.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on May 23, 2022, 9:53 AM
Question by: kirk Dorey on Jan 20, 2022, 6:47 PM
Hey Kirk, thanks for the question! The manufacturer indicates that the water level in the sump is adjustable. At its max setting of 9" water height, the sump will hold roughly 13 gal. At its lowest setting at 5.1" it will hold roughly 7.5 gal.
Answer by: James Johnson (BRS Staff) on Jan 21, 2022, 11:20 AM