The Red Sea Reefer 250 is a 66-gallon reef-ready aquarium system that retails new between $900 and $1,100 depending on the retailer and whether any accessories are bundled. If you're searching for one for sale, you'll find them through authorized aquarium retailers, Amazon, and the used market, where they typically sell for $400 to $700 depending on age and condition.

This article walks through the Reefer 250's specifications, what makes it a popular choice for reef keepers, where to find one new or used, and what questions to ask before handing over money.

Red Sea Reefer 250 Specifications

The Reefer 250 has a display tank volume of approximately 66 gallons US (250 liters), which is where the model number comes from. The full system volume including sump runs around 75 to 80 gallons when filled to operating level.

Key dimensions: - Display tank: 39.4 x 23.6 x 21.7 inches (100 x 60 x 55 cm) - Overall height with cabinet: 55.9 inches (142 cm) - Cabinet footprint: 39.4 x 23.6 inches (100 x 60 cm) - Glass thickness: 10mm Opti-Clear low-iron glass

The tank uses a dual overflow system with an included surface skimmer and return nozzle. The overflow boxes are designed to be near-silent when dialed in, using Red Sea's patented "Silent Overflow" plumbing. The sump is a Red Sea Reefer Sump 250, with separate chambers for protein skimmer, media reactors, and return pump.

What's Included in the Box

The Reefer 250 system ships with: - Display tank with overflow boxes installed - Reefer Sump 250 - Cabinet with doors and cable management cutouts - Plumbing kit (flexible tubing, union fittings, ball valves) - Surface skimmer - Return nozzle

Not included: return pump, protein skimmer, lighting, and heater. Budget an additional $300 to $600 for these items on top of the tank purchase price.

The 250 sits in a sweet spot between too small to be stable and too large for most living rooms. At roughly 66 gallons of display volume, you have enough water volume to maintain stable parameters without needing a full-time maintenance regimen, but the footprint (39 x 24 inches) fits in most spaces where a 4-foot tank can go.

It's also sized for a meaningful coral collection. A 24-inch wide tank gives you depth to create a front-to-back aquascape with overhangs and caves, which smaller tanks don't allow. The 10mm glass makes the tank sturdy enough for hard corals without risking structural flex.

For comparison, the Reefer 170 (45 gallons) is noticeably more challenging to keep stable, and the Reefer 350 (92 gallons) requires a more powerful return pump and skimmer at greater expense. The 250 hits the middle ground that most intermediate reef keepers find satisfying.

Buying a New Reefer 250

Authorized Retailers

Red Sea equipment is sold through authorized dealers including Bulk Reef Supply (BRS), Marine Depot, and Amazon. Pricing across these retailers is usually within $50 of each other because Red Sea enforces minimum advertised pricing.

Watch for holiday sales, particularly around Black Friday and in late spring. BRS runs promotions where they bundle a return pump or skimmer with a Reefer system, which can reduce your total startup cost by $100 to $200.

What to Confirm Before Ordering

Shipping damage happens with large aquariums. Before accepting delivery of a crated Reefer system, inspect the outer packaging for impact damage. If you're ordering through a local fish store, ask them to unbox and inspect the glass before you leave. Low-iron glass is durable but a hairline crack at the edge is not always visible until the tank is filled.

Confirm whether your retailer includes a return pump in the bundle. Some listings for the Reefer 250 are tank-only, others include a Reef-Spec pump. Read the description carefully.

Buying a Used Reefer 250

The used reef tank market is active on Facebook Marketplace, Craigslist, and specialty forums like Reef2Reef. Used Reefer 250 systems regularly appear in metropolitan areas at prices ranging from $400 to $700 for tank-plus-sump, sometimes with equipment included.

What to Inspect on a Used Tank

Scratches: Look at the glass at a low angle with a flashlight. Light surface scratches on acrylic are repairable; deep scratches on the glass display panel are permanent. Interior scratches from cleaning with abrasive media are common and don't affect structural integrity but do affect aesthetics.

Silicone: Run a finger along every interior silicone seam. Any silicone that feels soft, peels easily, or shows gaps is a flag. Budget $50 and a weekend to reseal if needed. It's not complicated, but it does require a full dry-out period.

Overflow plumbing: Check the overflow boxes for cracks. The overflow weir on a Reefer 250 is glued acrylic, and cracks at stress points (particularly at the bottom corners) are a known issue on tanks that were transported without care.

Stand: Open the cabinet doors and look for water damage. Particle board cabinets absorb moisture from condensation over years of use. Swollen or delaminating panels indicate the cabinet was not well ventilated. A compromised cabinet can be replaced separately, but factor that cost in.

Questions to Ask the Seller

  • How long was the tank running, and what corals were kept?
  • Was it a FOWLR (fish only with live rock) or a reef? Reef tanks with high phosphate levels can etch glass surfaces over time.
  • Has the silicone ever been replaced?
  • Were there any leaks?
  • What was the return pump, and is it included?

Equipment You'll Need to Add

Once you have the Reefer 250, plan the rest of your equipment budget before buying anything. A workable equipment list:

Return pump: Sicce Syncra 4.0, Eheim 1260, or Red Sea Reef-Spec 1600. Budget $60 to $150.

Protein skimmer: Reef Octopus Classic 110-INT, Bubble Magus Curve 5, or Aqua Medic Turboflotor M. Budget $150 to $250 for a skimmer that fits the Reefer sump.

Lighting: AI Hydra 32 HD, Kessil A360X, or Radion XR15 G6 Pro. For a 39-inch tank you'll likely want two fixtures or one wide-spread LED. Budget $300 to $600.

Heater: Cobalt Neo-Therm 200W or Eheim Jager 200W. Budget $30 to $60.

For a broader look at what equipment performs well in reef tanks this size, the Best Aquarium Equipment roundup is a good starting point. You can also cross-reference the Top Aquarium Equipment guide for skimmer and lighting comparisons.

FAQ

Is the Reefer 250 a good first reef tank? It's a reasonable choice for someone who has kept a saltwater tank before and is ready to move to corals. For a true beginner, the Reefer 170 or an all-in-one like the Red Sea Max Nano might be less overwhelming to manage initially.

Does the Reefer 250 come with lighting? No. Lighting is sold separately. Red Sea sells ReefLED fixtures that are designed to mount on the Reefer, but you can use any brand of reef LED that covers the 39-inch display length.

What return pump fits the Reefer 250 sump? The sump return chamber accepts pumps with a footprint up to roughly 6 x 6 inches. The Sicce Syncra 4.0, Eheim 1260, and Red Sea Reef-Spec 1600 all fit without modification. Avoid oversized canister or external pumps unless you're comfortable plumbing them externally.

Can I upgrade the Reefer 250 to a peninsula or room-divider setup? The standard Reefer 250 is designed for single-side viewing. Red Sea makes Reefer Peninsula models for three-sided viewing, but these are a separate product line. Converting a standard Reefer to peninsula viewing requires removing the back panel covering, which voids the warranty.

Key Takeaways

The Reefer 250 is a well-built, 66-gallon reef system with a good track record in the hobby. New, it runs $900 to $1,100 before equipment. Used, you can find complete setups for $500 to $800 with some gear included. Whether you're buying new or used, inspect the glass for scratches, check the silicone seams, and confirm what equipment is included before agreeing on a price. Budget at least $500 for a return pump, skimmer, and lighting on top of the tank cost, and you'll have a complete, capable reef system.