Description
The Red Sea REEFER 425 G3 is the standard build of Red Sea’s third-generation REEFER platform. It arrives as a complete, reef-ready foundation, which means the tank, cabinet, sump, plumbing and top-off are done for you and the filtration, lighting and flow are yours to choose. Its display holds 90.6 gallons, the sump holds 24, and the whole system carries 114.4 gallons of water on a 47.2 by 23.6 inch footprint.
REEFER 425 G3 specifications
| Display volume | 90.6 US gallons |
|---|---|
| Sump volume | 24 US gallons |
| Total system volume | 114.4 US gallons |
| Tank footprint (L x W) | 47.2 x 23.6 inches |
| Tank height | 21.7 inches |
| Total height, tank on cabinet | 55.9 inches |
| Cabinet finishes | Black or white |
| Warranty | Up to 5 years for eligible original U.S. purchasers who register the new system with Red Sea within 90 days. Non-transferable. |
Volumes are the manufacturer’s figures for the system as built. Actual water volume in your room will be lower once rock and sand go in. Total height is measured to the top of the tank with it standing on its cabinet, so measure your ceiling and any shelf above the tank before you order.
Compare every REEFER G3 size side by side if you are still deciding. Footprints, tank heights and total heights on the cabinet, all seventeen chassis on one page.
What comes with the REEFER G3
- Ultra-clear, beveled-edge rimless glass with a low-profile overflow
- Marine-spec laminated cabinet in black or white
- Glass sump, sized to accept Red Sea’s ReefMat fleece rollers and REEFER DC protein skimmers (both sold separately)
- Ready-to-use pre-glued plumbing with the ReefGate flow valve for quiet, tunable drains
- ReefATO+ auto top-off, temperature monitor and leak detector, all reporting to the ReefBeat app
- Eligible original U.S. purchasers can receive five-year warranty coverage by registering an eligible new Red Sea system within 90 days. The warranty is non-transferable.
The ReefATO+ sensor carries a backup float above the primary sensor, so an overfill shuts the pump down on its own, and the leak detector is saltwater-rated rather than a freshwater part pressed into service.
Will it fit, and is it the right size for you
Four feet long, 23.6 inches deep, 90.6 gallons in the display. If someone asks us which REEFER to buy and gives us no other information, this is the one we name. The footprint takes a real aquascape, the volume is forgiving enough to survive a mistake, and it still fits a normal wall in a normal house.
What goes with the REEFER 425 G3
A lid is the one accessory we tell people to buy at the same time as the tank, not later. Every wrasse, every anthias and most of the tangs worth owning will find the one gap you left open. The one cut for this exact model is the Red Sea mesh lid for the REEFER 425 G3.
- Skimming and mechanical filtration: the sump is cut for the REEFER DC 300, REEFER DC 600, REEFER DC 900 and the ReefMat 250, ReefMat 500, ReefMat 1200. Which size you want depends on how heavily you plan to stock and feed the tank, not only on the water volume, so call us and we will size it against your actual plan rather than a chart.
- Lighting: ReefLED G2 60, ReefLED G2 115, ReefLED G2 170. If you would rather have the lighting fitted and mounted at the factory, look at the REEFER Deluxe build of this same tank instead.
- In-tank flow: ReefWave 25 and ReefWave 45.
- Everything else Red Sea: salt, Reef Foundation, Trace Colors, test kits, dosing and ATO are all in our Red Sea department.
If you are working out the real number before you commit, we wrote up what a saltwater aquarium actually costs with actual figures from builds we have done. And if you want us to handle the whole thing, that is what our aquarium installation and maintenance page covers.
Working out the budget beyond the aquarium? Open our Red Sea REEFER build planner and select the 425 G3 to compare packages and plan the remaining equipment. Confirm the final delivered price with our staff before ordering.
Buying it from us
We are an authorized Red Sea dealer and we order any REEFER G3 configuration directly, including finishes and sizes that are not listed on this page. If you are in Key West or anywhere in the Keys, we also install: delivery, leveling, plumbing, the first fill, cycling and the handover. We build these tanks for a living, so if you want to talk through whether the REEFER 425 G3 is the right call before you spend the money, call the shop and ask for me.
Full manufacturer specifications are on Red Sea’s website.
Shipping See current rates and ship days.
Shipping & Returns
- Equipment and dry goods ship at their own rate. Free shipping at $349 or more applies to qualifying livestock only — corals, fish, inverts and live copepods. The $10 box & handling fee is a livestock packing fee and does not apply to dry-goods orders.
- All sales are final on equipment and dry goods. We are a retail store, not the manufacturer.
- Register your product with the manufacturer and keep your receipt — their warranty is how a faulty unit gets replaced, and they are faster at it than a shop could be.
- Not sure who to contact for a warranty claim? Call us and we will point you to the right place.
Ships from our Key West store · (305) 850-9949
Your Red Sea tank, with the details worked out.
Send us your preferred model, cabinet color, delivery ZIP and buying timeframe. We will review availability, equipment choices and delivery arrangements so you can evaluate a complete quote before committing.
Catalog prices are planning estimates. Final availability, delivery eligibility, freight and applicable tax require confirmation. Installation and maintenance is a local service in Key West and the Florida Keys; systems ship nationwide and you arrange the install elsewhere.
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