Reef Octopus

Octo Reef Sump 15A

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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: 14.96"L x 14.96"W x 13.78"H
  • Skimmer Section: 9.45"x 9.45"
  • Return Pump Section: 4.5"L x 6.5"W
  • ATO Volume: 1.5 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 6950291252043
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Product Questions

would this sump material? PSV or acrylic?
Question by: key tanaka on Mar 8, 2022, 11:36 PM
Hey there,
Thank you for reaching out to us. This sump is acrylic.
Answer by: Matt Lucero (BRS Staff) on Mar 9, 2022, 9:29 AM
What sizes aquarium is this rated for? I have a 75 gallon and cant have a huge sump. This one may fit
Question by: Wesley Coburn on Nov 24, 2021, 7:25 PM
This will work for an 80 gallon tank or smaller.
Answer by: Matt Lucero (BRS Staff) on Nov 27, 2021, 12:31 PM
would this sump work on a 40g breeder?
Question by: shayne a ralston on Nov 19, 2021, 4:07 AM
Yes, this will work on a tank up to 80-gallons.
Answer by: Matt Lucero (BRS Staff) on Nov 27, 2021, 1:12 PM
I recently bought a used Red Sea Reefer 250, and found the sump was leaking when I got home to fill it. Would this be a sufficient replacement?
Question by: Justin on Sep 13, 2020, 1:31 AM
Yes, it would be a great replacement.
Answer by: Matt Lucero (BRS Staff) on Nov 5, 2021, 9:39 AM