{"product_id":"red-sea-reefer-g3-aquarium-system-300","title":"Red Sea REEFER G3 Aquarium System 300","description":"\u003cp\u003e\u003cstrong\u003eA reef platform, not a shortcut to one.\u003c\/strong\u003e The Red Sea REEFER G3 300 is a 301-litre rimless reef aquarium system — display tank, glass sump and matching cabinet, built to Red Sea's current G3 generation. It ships with the tank, sump, cabinet and Red Sea's ReefATO+ auto top-off already fitted. A return pump, protein skimmer and lighting are not included — you choose and fit those yourself.\u003c\/p\u003e\n\n\u003ch3\u003eKey features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRimless ultra-clear display\u003c\/strong\u003e — 247 L display volume behind 12 mm front and side glass, with a low-profile internal overflow so there's no visible overflow box breaking the sightlines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReefATO+ auto top-off included\u003c\/strong\u003e — Red Sea's electronic top-off system, with temperature monitoring and leak detection, comes standard on G3 rather than as an upgrade.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG3 redesigned plumbing\u003c\/strong\u003e — fewer sharp 90° bends and a new ReefGate flow valve are built to deliver more water flow than the equivalent G2 model, with quieter, more precise drain control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePurpose-built 57 L glass sump\u003c\/strong\u003e — pre-glued plumbing and a mechanical filtration chamber with 225-micron mesh, ready for a ReefMat fleece roller (sold separately).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine-spec cabinet\u003c\/strong\u003e — laminated plywood with epoxy-painted doors, stainless steel hinges and levelling feet, in the colour shown on this listing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e301 L total system volume\u003c\/strong\u003e — the figure to use for salt mix, dosing and medication calculations, not the smaller 247 L display-only figure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eREEFER G3 300 aquarium, rimless ultra-clear glass with internal overflow\u003c\/li\u003e\n\u003cli\u003eMarine-spec cabinet, in the colour shown\u003c\/li\u003e\n\u003cli\u003eGlass sump with pre-glued plumbing and ReefGate flow valve\u003c\/li\u003e\n\u003cli\u003eReefATO+ auto top-off system, with temperature monitoring and leak detection\u003c\/li\u003e\n\u003cli\u003eMechanical filtration chamber with 225-micron mesh filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNot included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReturn pump\u003c\/li\u003e\n\u003cli\u003eProtein skimmer\u003c\/li\u003e\n\u003cli\u003eLighting\u003c\/li\u003e\n\u003cli\u003eReefMat fleece roller filter\u003c\/li\u003e\n\u003cli\u003eHeater\u003c\/li\u003e\n\u003cli\u003eSalt, substrate, aquascape and livestock\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eREEFER G3 300\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay volume\u003c\/td\u003e\n\u003ctd\u003e247 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSump volume\u003c\/td\u003e\n\u003ctd\u003e57 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal system volume\u003c\/td\u003e\n\u003ctd\u003e301 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay dimensions (L × W × H)\u003c\/td\u003e\n\u003ctd\u003e90 × 57 × 55 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal height with cabinet\u003c\/td\u003e\n\u003ctd\u003e142 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass\u003c\/td\u003e\n\u003ctd\u003e12 mm front \/ sides \/ bottom, 10 mm back, ultra-clear, beveled, rimless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCabinet\u003c\/td\u003e\n\u003ctd\u003eMarine-spec laminated plywood, black or white\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverflow\u003c\/td\u003e\n\u003ctd\u003eInternal, silent, ReefGate flow valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuto top-off\u003c\/td\u003e\n\u003ctd\u003eReefATO+ included — temperature monitoring, leak detection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGeneration\u003c\/td\u003e\n\u003ctd\u003eG3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater type\u003c\/td\u003e\n\u003ctd\u003eMarine \/ reef\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eREEFER G3 versus REEFER MAX\u003c\/h3\u003e\n\u003cp\u003eThis listing is the base G3 platform: tank, sump, cabinet and auto top-off, with your choice of pump, skimmer and light fitted afterwards. Red Sea's \u003ca href=\"\/products\/red-sea-reefer-max-425-g3\"\u003eREEFER MAX\u003c\/a\u003e line ships as a complete kit, with a pump, skimmer and lighting already fitted, at a higher price point. If you want a system that's ready to run on day one, check a MAX model rather than assuming this one includes it.\u003c\/p\u003e\n\n\u003ch3\u003eWhich REEFER G3 do I need?\u003c\/h3\u003e\n\u003cp\u003eThe 300 is the smallest footprint of Red Sea's current G3 line-up: 90 × 57 cm, a practical fit for a first sumped reef system or a space-limited room. Step up to the 350 for a longer footprint at a similar depth, or to the S-550 for meaningfully more display volume without gaining length.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTotal volume\u003c\/th\u003e\n\u003cth\u003eDisplay volume\u003c\/th\u003e\n\u003cth\u003eSump volume\u003c\/th\u003e\n\u003cth\u003eDisplay dimensions (L×W×H)\u003c\/th\u003e\n\u003cth\u003eTotal height\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eREEFER G3 300\u003c\/td\u003e\n\u003ctd\u003e301 L\u003c\/td\u003e\n\u003ctd\u003e247 L\u003c\/td\u003e\n\u003ctd\u003e57 L\u003c\/td\u003e\n\u003ctd\u003e90 × 57 × 55 cm\u003c\/td\u003e\n\u003ctd\u003e142 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREEFER G3 350\u003c\/td\u003e\n\u003ctd\u003e342 L\u003c\/td\u003e\n\u003ctd\u003e273 L\u003c\/td\u003e\n\u003ctd\u003e69 L\u003c\/td\u003e\n\u003ctd\u003e120 × 50 × 53 cm\u003c\/td\u003e\n\u003ctd\u003e140 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREEFER G3 S-550\u003c\/td\u003e\n\u003ctd\u003e549 L\u003c\/td\u003e\n\u003ctd\u003e448 L\u003c\/td\u003e\n\u003ctd\u003e101 L\u003c\/td\u003e\n\u003ctd\u003e120 × 68 × 65 cm\u003c\/td\u003e\n\u003ctd\u003e153 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREEFER G3 625\u003c\/td\u003e\n\u003ctd\u003e620 L\u003c\/td\u003e\n\u003ctd\u003e497 L\u003c\/td\u003e\n\u003ctd\u003e121 L\u003c\/td\u003e\n\u003ctd\u003e150 × 65 × 60 cm\u003c\/td\u003e\n\u003ctd\u003e148 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREEFER G3 750\u003c\/td\u003e\n\u003ctd\u003e750 L\u003c\/td\u003e\n\u003ctd\u003e600 L\u003c\/td\u003e\n\u003ctd\u003e151 L\u003c\/td\u003e\n\u003ctd\u003e180 × 65 × 60 cm\u003c\/td\u003e\n\u003ctd\u003e148 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat changed in G3\u003c\/h3\u003e\n\u003cp\u003eRed Sea redesigned the plumbing for this generation, cutting the number of sharp 90° bends and fitting a new ReefGate flow valve for precise, near-silent control over the drain rate. Every G3 model, including the 300, now ships with the ReefATO+ electronic auto top-off as standard, where earlier REEFER generations needed it as an add-on.\u003c\/p\u003e\n\n\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for:\u003c\/strong\u003e reef and marine keepers who want a rimless drilled system with a proper sump, and are sourcing their own return pump, skimmer and lighting to suit their bioload and budget.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e anyone who wants a single purchase that includes a skimmer, return pump and lighting — that's Red Sea's MAX range, not this listing. Budget for that equipment before you commission the tank.\u003c\/p\u003e\n\n\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\n\u003cp\u003eRed Sea's REEFER range carries a manufacturer's warranty of 3 years standard, extendable to 5 years total with registration within 90 days of purchase — provided in addition to your rights under Australian Consumer Law. Mains-powered components, including the ReefATO+ unit, run on 240 V \/ 50 Hz Australian supply. Red Sea does not publish an empty or filled weight for this system; as a floor-loading guide, the water alone in a full 301 L system weighs around 301 kg, before the glass, cabinet, sump, aquascape and livestock are counted — check your floor's load rating before committing to a spot, particularly upstairs or over an unsupported span. This is a large glass and cabinet item delivered on a pallet; the cabinet requires assembly.\u003c\/p\u003e\n\n\u003ch3\u003eGoes well with\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-reefer-dc-skimmer-300-w-o-controller\"\u003eRed Sea Reefer DC Skimmer 300\u003c\/a\u003e — a protein skimmer sized to this sump; check your bioload before stepping up to the 600.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-salt-20kg-refill-box-600ltr\"\u003eRed Sea Salt 20kg Refill Box\u003c\/a\u003e — mixes enough saltwater for water changes and topping up a system this size.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-seawater-refractometer\"\u003eRed Sea Seawater Refractometer\u003c\/a\u003e — for checking salinity before the tank goes live.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/red-sea-calcium-pro-testing-kit-75-tests\"\u003eRed Sea Calcium Pro Testing Kit\u003c\/a\u003e — reef dosing starts with knowing where your parameters sit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon questions\u003c\/h3\u003e\n\u003ch4\u003eDoes the REEFER G3 300 include a return pump or skimmer?\u003c\/h4\u003e\n\u003cp\u003eNo. This listing is the aquarium, sump, cabinet and ReefATO+ auto top-off only. A return pump and protein skimmer are sold separately, so you can size them to your stocking plan.\u003c\/p\u003e\n\u003ch4\u003eWhat does the 301 L figure on this listing mean?\u003c\/h4\u003e\n\u003cp\u003eIt's the total system volume — display plus sump combined. Use that figure, not the 247 L display-only volume, for salt mix and dosing calculations.\u003c\/p\u003e\n\u003ch4\u003eDoes it come with lighting?\u003c\/h4\u003e\n\u003cp\u003eNo. Choose a fixture sized to the 90 × 57 cm footprint separately.\u003c\/p\u003e\n\u003ch4\u003eIs the ReefATO+ auto top-off really included, or is that an upgrade?\u003c\/h4\u003e\n\u003cp\u003eIt's included as standard on every G3 model. Earlier REEFER generations needed it as a separate upgrade kit.\u003c\/p\u003e\n\u003ch4\u003eHow much does a full system weigh, and will my floor take it?\u003c\/h4\u003e\n\u003cp\u003eRed Sea doesn't publish a tank or cabinet weight for this model. The water alone in a full 301 L system weighs around 301 kg — worth checking your floor's load rating for a system this size, especially upstairs.\u003c\/p\u003e\n\u003ch4\u003eWhat's the difference between this and a REEFER MAX?\u003c\/h4\u003e\n\u003cp\u003eRed Sea's REEFER MAX line applies the same rimless build with a pump, skimmer and lighting already fitted. We don't currently stock a G3 MAX at exactly 301 L, but the \u003ca href=\"\/products\/red-sea-reefer-max-425-g3\"\u003eMax 425 G3\u003c\/a\u003e shows what a MAX kit includes if you'd rather buy pre-equipped.\u003c\/p\u003e","brand":"RedSea","offers":[{"title":"Default","offer_id":55269640208675,"sku":null,"price":2940.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/Red-Sea-REEFER-G3-Aquarium-System-300-Black-Inside.jpg?v=1782107611","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/red-sea-reefer-g3-aquarium-system-300","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}