• Rimless, ultra-clear glass — beveled-edge front and side panels for an unbroken view into the display.
• REEF-SPEC sump included — bubble trap sponge, a mechanical filtration compartment with 225-micron filter bags and media cups, and an adjustable-height skimmer chamber ready for a skimmer of your choosing.
• ReefATO+ automatic top-off — a 3-in-1 system with a digital temperature monitor, an audible-alarm leak detector and a titanium multi-input water-level probe, controlled through the ReefBeat app.
• Silent downflow system — an enlarged rectangular inlet and a high-precision valve on the downflow pipe cut the trickling noise a standard overflow makes.
• Dual side-facing return outlets and a full internal piping kit with both metric and US-sized bulkhead connectors, so plumbing in your own pump is straightforward.
• Self-assembly cabinet in marine-spec, water-resistant laminated construction, with adjustable levelling feet and stainless steel hinges.
• ReefMat-ready — the sump's filtration compartment is plug-and-play compatible with Red Sea's ReefMat 500/1200 auto-advance fleece roller, sold separately.

• Rimless ultra-clear glass aquarium, white cabinet
• REEF-SPEC glass sump with bubble trap sponge, mechanical filtration compartment, 225-micron filter bags and media cups
• Large central overflow box with surface skimmer and removable weir comb
• Silent downflow pipe with high-precision valve
• Internal piping kit with dual side return outlets and metric/US bulkhead connectors
• ReefATO+ automatic top-off system: digital temperature monitor, leak detector, titanium water-level probe, ATO pump and top-up reservoir
• ReefBeat smart controller connectivity for the ATO system

• Lighting
• Protein skimmer — the sump has an adjustable-height chamber ready to take one
• Return pump
• ReefMat auto-advance fleece roller filter
• Heater, salt, rock, sand and livestock — as with every aquarium we sell

The Reefer G2+ 425 has a 120 × 60 cm footprint (0.72 m²) and weighs approximately 690 kg fully filled, per Red Sea's own published system weight. Spread over its footprint, that works out to roughly 958 kg per square metre directly under the cabinet — a figure calculated from Red Sea's published weight and footprint, not a number Red Sea states directly. Standard suspended timber floors are not automatically rated for this; check with a builder or structural engineer before siting a filled 425 upstairs or on an older floor, and always position it over joists rather than mid-span where possible.

Red Sea sells this platform two ways. The Complete System — what this listing is — is the tank, cabinet, sump and plumbing, ready for you to fit your own lighting, skimmer and pump. The Reefer MAX adds Red Sea's own ReefLED lighting, a REEFER DC protein skimmer and a return pump, pre-matched to the tank, at a higher price. Neither is "better" — MAX suits a plug-and-play build on Red Sea's own equipment; the Complete System suits a build using equipment you already own or prefer from other brands.

All three sizes share the same sump design, ReefATO+ system and silent overflow — the difference is display volume, footprint and the floor loading that comes with it. The 425 is the entry point into the range: enough water volume for a serious reef display without the footprint or filled weight of the 525 or 625.

Suitable for a reefer building a system around their own choice of lighting, skimmer and return pump, or upgrading from a smaller tank while keeping equipment that already works. Suitable as a foundation for SPS, LPS or softie-dominant reef systems given appropriate equipment. Not suitable if you want everything matched and pre-fitted out of the box — that's what the Reefer MAX is for. Not suitable for a first fish-only freshwater setup; this is reef-spec plumbing sized and priced for saltwater.

Covered by a Red Sea manufacturer's warranty against defects in materials and workmanship, in addition to your rights under Australian Consumer Law. Red Sea's own published warranty terms are inconsistent across its literature — its operation manual states 24 months standard with a further 12 months on the glass aquarium if registered, while its own warranty registration page lists Australia as eligible for a longer extended term. We're confirming the current Australian figure with Red Sea directly; contact us before purchase if the exact term matters to your decision. The cabinet is self-assembly. Given the size and filled weight of this system, arrange help to move and position it, and confirm your delivery access (stairs, doorway width) before ordering.

A DC return pump sized to the sump's flow and your plumbing's head height, a protein skimmer rated for your intended bioload, and Red Sea lighting sized to a 60 cm-wide display — the same choices the Reefer MAX bundles in for you, bought separately here to suit your preferences and budget.

Does the Reefer G2+ 425 include lighting, a skimmer or a return pump?

No. This is the Complete System: tank, cabinet, sump, plumbing and the ReefATO+ auto top-off. Lighting, a protein skimmer and a return pump are all sold separately and fitted after purchase.

What's the difference between this and the Reefer MAX 425?

The Reefer MAX 425 is the same tank, cabinet, sump and plumbing with Red Sea's own ReefLED lighting, a REEFER DC skimmer and a return pump already fitted, at a higher price. This Complete System gives you the same foundation and lets you choose your own equipment.

Do I need to worry about floor loading?

Yes, if the tank will sit anywhere other than a slab-on-ground floor. At roughly 690 kg filled over a 0.72 m² footprint, that's around 958 kg/m² directly beneath the cabinet — have a builder or engineer confirm your floor can carry it before installing upstairs or on an older timber-frame floor.

Is the sump ready for a skimmer, or do I need to modify it?

The sump has an adjustable-height skimmer chamber built in, sized for a standard in-sump skimmer. You'll still need to buy and fit the skimmer itself.

Can I fit any brand of return pump and lighting?

Yes — the plumbing uses standard metric and US-sized bulkhead connectors and the cabinet has an open equipment area, so it isn't locked to Red Sea's own MAX equipment. Match pump flow to your sump's throughput and head height, and check your chosen light's mounting method against the tank's rimless top edge.