Red Sea REEFER 900 3XL BLACK Deluxe


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Red Sea is expanding their range of REEFER™ systems with 4 new models which still maintain the familiar rimless format and clean lines of the REEFER series. The impressive, 900 liter / 240 gal. REEFER 3XL 900 model offers hobbyists the freedom to create a truly spectacular reef. 200 cm / 79” long, and 65 cm / 25.6” high and wide, the 3XL 900 introduces an enlarged overflow box with dual side-facing return pump outlets and increased surface skimming that provides ideal water circulation in the tanks with flows of up to 10,000 lph / 2600 gph. These new features have also been implemented on the latest version of the XXL 750 V3 giving it a new look and significantly improved flow dynamics. Both of these systems come complete with fittings to attach either a single or dual return pumps.

A unique feature of the 3XL 900 is a split sump system that provides unsurpassed flexibility. The main sump is set for the usual filtration functions with an optional refugium chamber and a dedicated adjustable height skimmer chamber. The sump extension (60 liters/ 16 gal.) 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 (83 liters / 22 gal.) RO reservoir or saltwater reservoir for automated water changes.

4 new REEFER™ models, dramatically expanding the range of its premium reef-ready aquariums to include the XL 200, XL 300, XXL 750 V3, & 3XL 900.

Furthermore, as part of the continued commitment and support of its aquarium systems, Red Sea is enabling all first buyers to register online to extend the standard 2-year warranty on all aquariums for an additional 1 year at no cost.


Features of the Red Sea REEFER™ 3XL 900 include:


  • Rimless, ultra-clear, beveled edge glass aquarium
  • 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
  • Unique split sump system for unsurpassed flexibility:
    • Professional refugium-ready main sump with variable height skimmer chamber and micron filter bags and media cups.
    • Extension sump (60 liters/ 16 gal) can be used as a dedicated frag-tank or refugium. Alternatively, it can be disconnected and used as an independent reservoir of 83 liters / 22 gal.
  • Silent, regulated down-flow system with emergency overflow
  • Integrated automatic top-up system with reservoir
  • Assembly-ready piping – no gluing required

Reefer Model Comparison:

XXL 750 v3

3XL 900

Main Features

Ultra Clear Front
and Side Glass:
Front Glass Thickness: 3/4" (19 mm) 3/4" (19 mm)
Enlarged Built-In
Surface Skimmer:
Integrated ATO System:

System Volumes

Display Tank
Water Volume:
160 gallons
600 liters
192 gallons
720 liters
In Cabinet Sump
Water Volume:
40 gallons
150 liters
48 gallons
180 liters
Total System Water Volume: 200 gallons
750 liters
240 gallons
900 liters
RO Reservoir: 7.6 Gallons (28.7 L)

System Dimensions

Display Tank Length: 71" (180cm) 79" (200cm)
Display Tank Height: 23.6" (60cm) 25.6" (65cm)
Display Tank Width: 25.6" (65cm) 25.6" (65cm)
Total System Height
with Cabinet:
58.3" (148 cm) 60" (153 cm)

Sump Dimensions

Water Height: 8.3 - 10.6"
21 - 27 cm
8.3 - 10.6"
21 - 27 cm
Skimmer Chamber
w/o Refugium Wall:
25.6 x 20"
65 x 51 cm
17.7 x 20"
45 x 51 cm
Skimmer Chamber
w/ Refugium Wall:
25.6 x 11"
65 x 28 cm
17.7 x 11"
45 x 28 cm
Return Pump
13.7 - 11"
35 x 28 cm
13 - 11"
33 x 28 cm
Extension Sump: 20 x 16.5"
51 - 42 cm

Return Pump

3/4 Threaded Hose Barb
Pipe Int. Diameter:
1" (25 mm) 1" (25 mm)
Recommended Flow Rate: 2640 gph
10000 lph
2640 gph
10000 lph

New Special Features

Adjustable Height
Skimmer Chamber:
Dual Side-Facing
Return Pump Outlets:
Split Sump System:
Refugium Ready:
225 Micron Thin-Mesh
Filter Socks:
2 2
Filter Media Cup: 2 2
Quick Release Cabinet
Door Hinges:
Heavy Duty Levelable
Plywood Cabinet:

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