Red Sea Reefer 300 G3+ - White Cabinet

Red Sea Reefer 300 G3+ - White Cabinet

The Red Sea Reefer 300 G3+ - White Cabinet pairs a 246 litre (65 US gallon) eurobraced ultra-clear aquarium with a 54 litre (14.3 gallon) REEF-SPEC sump, reinforced white marine-spec plywood cabinet, and included ReefControl Lite smart water management. With 300 litres (79.3 US gallons) of total system volume and a 90 x 57.5 cm (35.4 x 22.6 inch) display footprint, it offers a spacious foundation for a customized reef aquarium without moving into the much longer 120 cm systems.

The G3+ generation introduces structural eurobracing and ReefControl Lite automation as standard features. Its ReefControl ATO Module handles automatic freshwater replenishment and temperature monitoring, while the ReefGate precision valve, enlarged rectangular downflow, improved return plumbing, and ReefMat-ready sump provide the filtration infrastructure. The white cabinet gives the aquarium a bright furniture-style appearance, with lighting, skimming, return circulation, and additional monitoring equipment selected separately.

Red Sea Reefer 300 G3+ White Aquarium Construction

• 90 cm (35.4 inch) viewing length: The aquarium provides room for separate rock structures and coral placement areas, allowing a more open aquascape than the shorter 60 cm REEFER 200 G3+.
• 57.5 cm (22.6 inch) display depth: The front-to-back dimension creates space for rock islands, slopes, coral gardens, and open sand areas without requiring a wider or longer system.
• 12 mm ultra-clear front glass: The low-iron viewing panel offers clarity for coral and fish displays, with new 10 mm (0.39 inch) jet-black eurobracing providing additional perimeter reinforcement.
• Premium glass bonding: High-quality euro-silicone joins the aquarium panels and forms part of Red Sea's reinforced G3+ construction.
• Reinforced white cabinet: The marine-spec laminated plywood stand features epoxy-painted splash-resistant doors, stainless steel hinges, and adjustable leveling feet.
• Separate filtration equipment area: The sump houses mechanical filtration, skimming, and return equipment beneath the aquarium instead of using space inside the main display.

Built-In ReefControl Lite and Freshwater Top-Off

The REEFER 300 G3+ supplies both ReefControl Lite and the ReefControl ATO Module, making automatic top-off and temperature monitoring part of the aquarium's standard equipment. Customers can later expand the monitoring capabilities with compatible ReefSense products rather than replacing the included controller simply to begin basic aquarium automation.

• ReefControl Lite platform: The included controller supports up to two compatible ReefSense probes or sensors and one additional 12V DC device.
• Digital water-level management: The ATO sensor and pump work with ReefControl Lite to replace evaporated freshwater and help maintain stable sump water level and salinity.
• Integrated temperature monitoring: The automatic top-off level sensor includes a digital temperature sensor for readings and notifications through ReefControl.
• ATO pump and installation components: The module includes the DC top-off pump, digital level sensor, mounting components, silicone tubing, tube holder, and siphon breaker.
• Additional monitoring: Compatible ReefSense probes and sensors can be added for further aquarium data, while ReefControl Power offers an optional route to connected AC equipment management.
• Lite versus Pro distinction: The 300 G3+ includes ReefControl Lite, not the Pro controller supplied with larger G3+ models. Additional pH, salinity, ORP, and other probes must be purchased separately unless specifically supplied in another package configuration.

Quiet Overflow and Improved Return Water Distribution

The central overflow collects surface water through removable skimming combs and directs it to the sump through the regulated downflow. Red Sea's enlarged rectangular inlet reduces turbulence, while the high-precision ReefGate valve allows the flow to be fine-tuned for stable, near-silent operation.

• ReefGate flow adjustment: Small valve changes regulate the main downpipe, allowing the operating water level inside the overflow to be balanced with the chosen return pump.
• Hydrodynamic pipework: The compact G3+ plumbing uses redesigned connections and more gradual pipe bends to reduce unnecessary flow losses.
• Curved 25 mm (approximately 1 inch) return outlet: One curved outlet directs filtered water into the display. Dual-return configurations are available on larger REEFER models rather than the 300.
• Removable surface skimmer: The overflow comb sections can be removed for cleaning so debris and deposits do not accumulate around the inlet.
• Secondary overflow bypass: The plumbing includes a regulated main downpipe and secondary bypass as part of the aquarium's drainage arrangement.
• Custom plumbing options: Optional metric and USA connection kits allow modifications to the standard plumbing when required for a customized installation.

ReefMat-Ready 54 Litre Sump and Optional Refugium

The 54 litre (14.3 US gallon) REEF-SPEC sump is one of the practical advantages of the REEFER 300 G3+ over the 200. It includes a media cup as well as the supplied mechanical filter bag and supports an optional refugium divider, giving aquarists additional filtration choices alongside the adjustable skimmer chamber.

• 225-micron filter bag: One fine-mesh mechanical filter bag is included to trap suspended debris as water travels into the sump.
• Included media cup: One cup provides an additional option within the mechanical filtration compartment.
• ReefMat-ready design: The mechanical filtration section can be removed to install compatible Red Sea automatic fleece filtration without changing the standard drain plumbing.
• Optional ReefMat 500: The corresponding REEFER MAX 300 G3+ uses the ReefMat 500, providing a manufacturer-supported reference for an optional roller-filter upgrade.
• Adjustable skimmer operating depth: The chamber water level can be set from 17 to 23 cm (6.7-9.1 inches) to accommodate compatible protein skimmers.
• Optional dedicated refugium: A compatible divider can create a separate refugium chamber within the sump, allowing additional flexibility when planning nutrient management.
• Bubble management: Water travels through a bubble-stripping section before the return pump compartment, reducing the likelihood of bubbles reaching the aquarium display.

Why Choose the REEFER 300 G3+ Over the 200?

Both the 200 and 300 G3+ use the same 57.5 cm (22.6 inch) front-to-back depth and include ReefControl Lite with automatic top-off. The 300's advantages are its longer display, increased volume, and additional sump configuration options rather than a different level of included controller.

• Additional aquarium length: The 300 measures 90 cm (35.4 inches) long compared with the 200's 60 cm (23.6 inches), providing 30 cm (11.8 inches) more horizontal reefscaping space.
• Larger system volume: The 300 provides 100 litres (approximately 26.4 US gallons) more total water volume and a 54 litre (14.3 gallon) sump compared with 42 litres (11.1 gallons) on the 200.
• Adjustable filtration options: The 300 adds the included filter media cup and support for an optional dedicated refugium divider.
• Lighting reference: Red Sea pairs the MAX 300 with two ReefLED G2 115 fixtures, compared with one on the MAX 200. Lights are sold separately for the standard REEFER G3+ aquarium.
• Return pump recommendation: Red Sea specifies one ReefRun G2 4000 in the MAX 300 configuration. The pump must be purchased separately for the base system.
• Practical reef planning: Choose a skimmer that fits the adjustable 17-23 cm (6.7-9.1 inch) chamber, supplement return flow with appropriate wavemakers, and provide a freshwater reservoir for the included ATO pump.

Red Sea Reefer 300 G3+ White Specifications

• Total system water volume: 300 L / approximately 79.3 US gal.
• Display aquarium volume: 246 L / approximately 65 US gal.
• In-cabinet sump volume: 54 L / approximately 14.3 US gal.
• Display dimensions: 90 cm L x 57.5 cm W x 55 cm H / approximately 35.4 x 22.6 x 21.7 inches.
• Total height including cabinet: 142 cm / approximately 55.9 inches.
• Front viewing glass thickness: 12 mm / approximately 0.47 inches.
• Upper eurobracing: 10 mm / approximately 0.39 inches.
• Glass construction: Eurobraced ultra-clear glass bonded with high-quality euro-silicone.
• Cabinet: White reinforced marine-spec plywood with stainless steel hinges, splash-resistant doors, and adjustable leveling feet.
• Return plumbing: Single curved 25 mm outlet.
• Mechanical filtration: Removable ReefMat-ready compartment with one 225-micron filter bag and one media cup.
• Skimmer chamber water depth: Adjustable from 17-23 cm / approximately 6.7-9.1 inches.
• Refugium compatibility: Optional dedicated sump divider.
• Included aquarium controller: ReefControl Lite, supporting up to two compatible ReefSense probes or sensors and one additional 12V DC device.
• Included top-off hardware: ReefControl ATO Module with digital level and temperature sensor, DC pump, and installation accessories.
• Recommended return pump: ReefRun G2 4000, sold separately.
• Optional roller filtration: ReefMat 500, sold separately.
• Manufacturer warranty: Standard 3 years, extendable to 5 years at no extra charge when registered within 90 days of purchase, subject to warranty terms.

Red Sea REEFER G3+ Series Video

Shipping Notes

• Red Sea aquariums are exempt from our free shipping policy.
• To avoid delays, please order your aquarium separately from other products. If purchasing additional items, place one order for the aquarium and a second order for your other products.
• Orders shipping to the Northwest Territories, Yukon, or Nunavut require a shipping quote. Please call for details.
• Red Sea aquariums are brought in and shipped on an as-ordered basis. The average turnaround time before shipping is approximately two business days, except where noted below.
• All shipments outside the Vancouver area are sent by trucking company with fully insured residential delivery and power tailgate service.
• Orders within British Columbia and, in some circumstances, Alberta may require an additional 5-10 business days for processing. Orders from Alberta and provinces farther east generally ship directly from the distributor in Ontario within two business days.
• For in-store pickup, select that option at checkout to avoid delivery charges. You will be notified when the aquarium arrives, usually within 5-10 business days.
• Red Sea MAX S Series aquariums are always special order and generally require 3-6 weeks before shipping.
• Freight delivery includes transporting the aquarium to the destination address and unloading it. The freight company is not responsible for carrying the aquarium inside the building.
• Freight charges have been substantially subsidized to help reduce the delivery cost of your new Red Sea aquarium.
• Rural, remote, and extended-service areas may require an additional shipping charge. We will contact you before shipping if an adjustment is necessary.

Directions

• Assemble and level the white marine-spec cabinet according to the manufacturer instructions before positioning the eurobraced glass aquarium.
• Install the sump, ReefGate valve, overflow, and supplied drain and return plumbing, ensuring that all connectors and seals are correctly seated.
• Install ReefControl Lite and the ReefControl ATO Module, mounting the digital level and temperature sensor in the designated sump position and placing the top-off pump in a suitable freshwater reservoir.
• Install the return pump, skimmer, lighting, heating, and additional circulation equipment before starting the aquarium. Set the adjustable skimmer water level for the selected protein skimmer.
• Follow the manufacturer's initial-fill procedure and check all plumbing connections for leaks.
• Adjust the ReefGate in small increments, allowing several minutes for the overflow water level to stabilize between adjustments.
• Perform a power-out test to confirm the sump has sufficient spare capacity when the return pump stops.
• Clean the mechanical filter bag, media cup, overflow combs, return outlet, and ATO sensor during routine maintenance.
• Register the aquarium with Red Sea within 90 days of purchase to qualify for the extended manufacturer warranty.

What's Included

• REEFER 300 G3+ eurobraced ultra-clear glass aquarium
• White reinforced marine-spec plywood cabinet with adjustable leveling feet and stainless steel hinges
• 54 litre REEF-SPEC sump with adjustable-height skimmer chamber and removable ReefMat-ready mechanical filtration compartment
• One 225-micron mechanical filter bag
• One filter media cup
• Downflow and return plumbing with ReefGate precision valve
• Central overflow with removable surface-skimming combs
• Single curved 25 mm return outlet
• ReefControl Lite Controller
• ReefControl ATO Module with digital level and temperature sensor, ATO pump, and installation accessories