CPR Aquatics

Medium AquaFuge2 Hang on Back Refugium with LED Lighting System

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AquaFuge2 External Hang On Back Refugium with LED lighting - Medium

Refugiums are a great option for growing algae to help control nutrients, as well as ideal conditions for harboring micro fauna.  With three different sizes the AquaFuge2 is a simple to use hang on back refugium.  With a recently redesigned black acrylic backing and unique baffle system, keeps the algae and substrate in the refugium and not the display tank. 

Refugiums are also a great way to introduce new fish or corals to a tank while giving them a place to feed and acclimate to a new system. 



  • Water Capacity: 3.6 gallons
  • Dimensions (not including light): 19" L X 4.5" W X 12" T
  • 11 Watt LED Light (18.5" x 1.25" x .5" light only)
  • Includes NEW LED Lighting
  • New Style Outlet
  • Includes powerhead


Manual Owners Manual


Whats Included

1x Refugium Body

1x Tunze Comline 900 Pump

1x Inlet Assembly

More Information
UPC 6463920470225
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Product Questions

Will this fit on a tank with a 1.5” rim??
Question by: Marty Massey on Nov 15, 2022, 5:32 PM
Hey there,
Thank you for reaching out to us. This can accommodate rim sizes up to 2” wide!
Answer by: Matt Lucero (BRS Staff) on Nov 22, 2022, 12:55 PM
How wide is the first "chamber" where the inlet brings water into the sump? I see a plastic partition on the base of the sump that does not go all the way up the back of the sump.
Question by: Trevor on May 11, 2022, 11:22 AM
Hey Trevor, thanks for reaching out. I am unable to find the exact data on this. I would recommend reaching out to the manufacturer directly via the info below

CPR Aquatics – (707) 826-9636 cpr@cpraquatic.com
Answer by: James Johnson (BRS Staff) on May 19, 2022, 9:54 AM
Will a rimless cube hold the weight of this refugium?
Question by: Jason Page on Jan 16, 2022, 6:24 PM
It should be fine, but we do recommend that it be on a rimmed tank as in the video.
Answer by: Matt Lucero (BRS Staff) on Jan 17, 2022, 12:06 PM
With the width being 4.5”, does that include the space/gap where it would mount onto the tank? With those support arms, it looks as if there would be a gap adding more width?
Question by: Sage on Sep 19, 2018, 12:37 AM
Great question! This will be the the width of the refugium box itself, and when mounting this you will need some added space behind the tank. Thank you!
Answer by: Nick Gansen on Sep 20, 2018, 8:27 AM
Can I use this as a HOB sump, similar to those found on all in one Aquariums?
Question by: Jonathan on Nov 21, 2017, 4:28 PM
You can use the Aquafuge as a HOB sump. Though the space available is pretty limited, just as long as the equipment fits into the Aquafuge, you should not have any issue using it in that fashion.
Answer by: Charlie on Nov 22, 2017, 1:22 PM
Can the medium HOB refugium be attached to the side of a sump. My water level is set at 8 inches and the sump is 16 inches tall. My concern is that the powerhead would not be able to reach down far enough to draw up the water.
Question by: Eric on Nov 19, 2017, 3:31 AM
This refugium would work well on the back of your aquarium. Keep in mind, it would need to be on the aquarium and not the sump, as the intake and outlet are set up for the higher water level and would not function with the lower level in a sump.

Happy reefing!
Answer by: Zack on Nov 24, 2017, 5:24 PM
Hello, I was just wondering if this would fit on the back of one of the 7.5g Mr Aqua tanks you guys have on the site?

Question by: Dylan Wilkinson on Nov 16, 2017, 8:48 AM
The Medium Aquafuge2 is 19" long where the 7.5g Mr. Aqua tank is only 12" long and are not compatible. Any HOB refugium that is under 11.5" long should work though.
Answer by: Charlie on Nov 18, 2017, 8:40 PM
What are the dimensions of this tank, is there a overflow box that would work for this, and will this work for a 29gal tank?
Question by: Brad on Nov 11, 2017, 9:37 PM
The Aquafuge2 Medium will work on a 29-gallon tank. The dimensions are listed at 19" L X 4.5" W X 12" T.
Answer by: Charlie on Nov 25, 2017, 9:48 AM