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CPR CITR 3 Pro In-Tank Refugium - Small


Item #: CR3358

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The updated CITR 3 Pro In-Tank Refugium or “Safe House” is designed to deliver several features and benefits that would help any aquarium. Some of these benefits include improving filtration by growing and harvesting macroalgae, and providing better food options for the aquarium by cultivating small organisms like copepods and amphipods.

The CITR 3 can also function as a protected area for newly added fish or invertebrates to acclimate in, and can help injured fish and corals regenerate damaged tissue without the need for a separate quarantine tank. The versatility, ease of use, and functionality provided by the CITR 3 will surely meet a wide variety of needs for many aquarists.


  • For use in fresh and saltwater aquariums - Good for any aquarium
  • Easy-to-install and affordable in-tank refugium
  • Circulation slots located on the side
  • Adjustable Height Bracket included
  • Simple way to grow macro algae, or isolated sensitive fish, coral and invertebrates
  • Use with or without pump depending on flow (DX Model Includes Pump)
  • A natural filter for any aquarium
  • 20% Greater Flow vs previous design!


  • Sizing depends on use (fish isolation vs filtration, for example), but for refugiums, benefits are directly proportional to size.
  • Pump inlet hole options are 3/8", 5/16", and 8.5 mm in diameter
  • Dimensions: 7 1/4 1/2" x 4" x 7 1/2"

What`s in the Box

  • CITR 3 Pro Body - Small
  • Attachment Bracket

Manufacturer information

CPR Aquatic Aquarium Supplies
In Arcata, located in Northern California, the sea is a way of life. From the advanced Marine Biology department at Humboldt State University, just up the hill from CPR’s headquarters, to Humboldt Bay, about a mile west, CPR is nestled in a perfect environment to develop equipment for marine aquariums. CPR was started in a small garage in 1987 to produce biological filters for local aquarists. People who used CPR filters were impressed by the high quality and affordable prices. Word spread and the company grew. Since then, CPR has expanded to a 10,000 sq. ft. production facility and has developed many innovative products over the years. CPR is incorporating new ideas and technologies all the time. Their goal is to allow aquarists to place the highest performing products in their tanks at reasonable prices.

3 Stars


Reviewed on
July 28, 2020

Yes, I would recommend this.

Decent started in tank refugium

Very little flow passes through it. I ended up upgrading to an external. For the price it’s good though

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