Trigger Systems

Crystal Cube Sump 18

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Trigger Systems Crystal Cube Sump 18

  • Dimensions: 18″ long x 18″ wide x 15″ high
  • Drain/Skimmer Section: 10.875″ x 11″
  • Front/Refugium Section: 17.5″ x 6.5″
  • Return Pump Section: 6.4375″ x 11″
  • Total Water Volume: 20 gallons
  • Skimmer Water Level: 9.5″ fixed

Some of the features of the CRYSTAL sumps are:

  • Locking Filter Sock Holder
  • Dual platforms (SUMP model)
  • Protein Skimmer section
  • Refugium section


The CRYSTAL series sumps have the same design and quality as the RUBY series sumps but are made of all clear material. The differences when compared to the equivalent RUBY sump:

  • Same or slightly smaller dimensions
  • All clear material instead of the RUBY red
  • No probe holder


Dual Platforms

CRYSTAL SUMP models come with dual platforms in the space before the return section. The top platform comes with a foam block filter and the bottom one is open to use for several different filtration methods (bag of carbon, bio balls, rubble rock, etc.). This feature is on the SUMP models only.


Locking Filter Sock Holder

Filter socks snap and lock into the filter sock holders to secure the filter sock from falling out when it becomes clogged and needs to be cleaned or replaced. The 4” filter socks are 100 micron rating.


Draw String Tabs

Tabs are located on the top support brace in front of the 1” bulkhead fittings which are included. The purpose of these tabs is to provide a location for tying off 7” diameter filter socks that have draw strings.


Trigger Systems specializes in aquarium sump manufacturing. They take pride in the robustness, efficiency of the design and visual appeal of our sumps. All sumps come with a full top support brace which are made of a solid piece of material. Without this the sump will over time begin to bow out from the humidity and water pressure. We also round instead of squaring the corners which exponentially increases the strength of the corner.
Trigger Systems has taken feedback from their customers through the years to enhance their line of awesome sumps. Little things in the design aspect will pay off considerably when putting the sumps to use. A simple example is that they always maximize the distance between the protein skimmer location and the return pump in an effort to minimize the chance for micro bubbles returning to the display.

More Information
UPC 744271816389
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Product Questions

Will the Reef Octopus ESSENCE S-130 INTERNAL PROTEIN SKIMMER fit into the crystal cube sump 18? I know according to the footprint it will however, I doubt that the filter sock was taken into account with the skimmer section measurements.
Question by: Johnathan Kaster on Feb 14, 2020, 8:40 PM
Hey there,

It should be able to fit, the skimmer is really small and the filter sock should not take up that much space.

Take care
Answer by: Thomas Billington on Feb 15, 2020, 11:45 AM