Red Sea

Reefer 3XL 900 System (240 Gal)

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Reefer systems have just gotten even larger. With an impressive 240 gallons of total water volume, the Reefer 3XL 900 takes pre-built reef systems to another level. Red Sea Reefer tanks are going to be the best foundation for any reefer that wants create a spectacular reef without having to hunt down the sump, stand, and plumbing.


With the framework of the Reefer 3XL 900 system, you have the freedom to choose the skimmer, lighting system, return pump, media reactors, and other hardware to complete your dream system. This system also features ultra-clear rimless, beveled glass and heavy-duty plywood cabinets with aluminum supports to ensure the longevity of the system.

  • Elegant, reinforced plywood Marine-Spec cabinet with aluminum support
  • Dual side-facing return pump outlets with fittings for one or two pumps
  • Enlarged overflow box for increased surface skimming
  • Professional refugium-ready main sump
  • Included extension sump (60 liters/ 16 gal) can be used as a frag-tank, refugium, or independant reservoir


Going from the top of the Reefer 3XL system down to the bottom, the first thing you will notice is the crystal clear glass and elegant beveled edges. The second thing you may or may not notice is the slim overflow that houses all the drain and returns plumbing to keep the water a constant level within the display tank. The return nozzle is fully adjustable to direct the flow where you need it, and the dual drain system keeps overflows from happening like a single drain design may encounter. The dual drain design has one main drain that includes a diaphragm valve for easy tuning and adjustments. The other drain is completely open to flow directly down into the sump in the event that the main drain gets clogged. If plumbing is one of the reasons why you have never wanted to install a tank with a sump don’t worry as Red Sea has done all the planning for you and there is no gluing needed to assemble and seal all the plumbing.


Split Sump - Unsurpassed Flexibility

A unique and exciting feature of the 3XL 900 is the split sump system. The main sump is set for the main filtration functions with an optional refugium chamber and a dedicated adjustable height skimmer chamber. The sump extension can be connected to the main sump and used for additional filtration, as a larger refugium or even as a dedicated frag tank. Alternatively, it can be set up as an independent unit and used as a full-size RO reservoir or saltwater reservoir for automated water changes.


REEFER™ 3XL Series Technical Data

  Specification 900
Main Features Ultra clear front and side glass Included
Ultra clear front glass thickness (mm) 19 (3/4″)
Enlarged Built in surface skimmer Included
System Volumes Display tank water volume (L) 720 (192 gal)
In cabinet sump water volume (L) 180 (48 gal)
Total system water volume (L) 90 (240 gal)
System Dimensions Display tank length (cm) 200 (79″)
Display tank height (cm) 65 (25.6″)
Display tank width (cm) 65 (25.6″)
Total system height with cabinet (cm) 153 (60″)
Sump Dimensions Water height (cm)  21-27 (8.3”-10.6″)
Skimmer chamber (cm)  45 x 51 (17.7″X20″)
Pump chamber (cm)  33 x 28 (13″X11″)
Recommended Return Pump Recommended flow (lph)
(pump not included)
(2600 gph)
New Special Features Dual Side-Facing Return Outlets Included
Split Sump System Included
Extension Sump 51 x 42 (20″X16.5″)
Adjustable Height Skimmer Chamber Yes
Refugium Ready Yes
Heavy Duty levelable Plywood Cabinet Included


Return Plumbing - 1" (25 mm)

Main Drain - 32 mm

Emergency Drain - 25 mm

Note: All Red Sea Reefer Aquariums include a black interior finish, regardless of the exterior finish. 


Return pump not included - We suggest either the Sicce Syncra Silent line of pumps or the Ecotech Vectra pumps.


Red Sea Drop Ship Information

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Product Questions

IS the pluming already installed for the sump and return
Question by: Sean on Apr 5, 2022, 11:46 PM
Hey there,
Thank you for reaching out to us. While it comes with the plumbing, you will need to attach it once it arrives.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Apr 7, 2022, 7:09 AM