The best places to find reef equipment for sale are Bulk Reef Supply, Marine Depot, Amazon, and the used market through Facebook Marketplace and Reef2Reef's classified section. Whether you're building a system from scratch or filling gaps in an existing tank, the reef hobby has a robust market for both new and second-hand gear.
This guide covers where to shop, which categories of equipment are worth buying new versus used, what to inspect when buying used, and how to budget realistically for a complete reef setup.
New vs. Used: A Practical Framework
Not all reef equipment ages the same way. Some items are fine to buy used with minimal risk. Others carry enough failure risk or sanitation concerns that buying new is the smarter call.
Equipment Worth Buying Used
Sumps: A used sump is usually fine. It's a glass or acrylic container. Inspect it for cracks and delaminating silicone, fill it with water to test before putting it in service, and you're good.
Aquarium stands and cabinets: Used stands are fine if the structural material isn't water-damaged. Press firmly on all panels. Particle board that has absorbed water will feel soft or spring slightly. Sound plywood is rigid. Check leveling feet and hinge hardware.
Protein skimmers: Used skimmers need inspection but are generally reliable if they've been maintained. Remove the impeller housing and check for wear on the needle wheel. Saltwater deposits (white calcium buildup) clean off with white vinegar. Look for cracks in the acrylic body, particularly around the union connections.
Powerheads and wavemakers: Motors wear over time but replacement impellers cost $10 to $20 for most models. Check that the impeller runs smoothly by hand before buying.
Rock: Dry base rock is safe to buy used. Live rock from an active tank carries the unknown contents of that tank (pests, pest eggs, undesirable algae). Quarantine accordingly.
Equipment Better Bought New
Heaters: Heater failures are one of the top causes of tank crashes. A used heater has an unknown number of thermal cycles behind it, and the thermostat calibration may have drifted. A new Cobalt Neo-Therm or Eheim Jager runs $30 to $60. Not worth risking your livestock on a $10 used heater.
UV sterilizers: UV bulb intensity degrades over time. Used UV units may not deliver their rated sterilization intensity even if the bulb still illuminates. If buying used, plan to replace the bulb immediately. Budget accordingly. A new bulb for a Coralife Turbo-Twist or Aqua Ultraviolet costs $25 to $50.
RO/DI membranes and filter cartridges: Never buy used filtration media. Buy a used RO/DI unit and replace all cartridges, membranes, and DI resin before running it.
Lighting: LED reef lighting holds value reasonably well, but diode degradation is real and not always visible. Buying a used LED fixture is reasonable if the price reflects its age and you can verify all diodes work at full power. Kessil, AI Hydra, and Radion fixtures all have strong used markets on Reef2Reef.
Where to Buy New Reef Equipment
Bulk Reef Supply (BRS)
BRS is the largest dedicated reef equipment retailer in the United States. They stock equipment from nearly every brand, publish detailed comparison videos for most product categories, and run BRS exclusive bundles that pair tanks with equipment at a discount. Free shipping on orders over $29. Their in-house brand (BRS brand) offers competitive RO/DI systems, carbon and GFO media, and two-part dosing chemicals at lower prices than name brands.
Marine Depot
Marine Depot has a large catalog comparable to BRS and frequently runs brand-specific promotions. Their customer service has a good reputation for handling warranty claims and returns. Free shipping thresholds and sale events are similar to BRS.
Amazon
Amazon stocks reef equipment from most major brands but watch for third-party sellers with gray market inventory. Stick to items sold and shipped by Amazon or by the brand directly. Amazon's return policy is more flexible than specialty retailers for equipment that arrives damaged.
Local Fish Stores (LFS)
Local stores allow you to see equipment before buying and often have knowledgeable staff who can advise on compatibility. Prices are typically 10 to 20 percent higher than online retailers, but you get the benefit of in-person support and immediate availability. Building a relationship with a good LFS pays off in access to live stock, advice, and occasional discounts for regulars.
The Used Market: Where to Look
Reef2Reef Classifieds
Reef2Reef's For Sale and Free sections are the most active online classifieds for reef equipment. Listings include photographs and seller history. Use the search function to filter by item type and location. Most transactions are local pickup or buyer-pays-shipping.
Facebook Marketplace
Facebook Marketplace is particularly strong for complete tank setups. Sellers moving or downsizing often list entire systems including tank, sump, lighting, and all equipment for a fraction of new cost. Complete 75-gallon reef setups with all equipment regularly appear for $800 to $1,500, which represents a saving of $2,000 or more compared to building new.
Local Reef Club Meetings and Frag Swaps
Local reef clubs post schedules on Reef2Reef and Facebook. Club members sell and trade equipment at meetings and frag swaps at prices that reflect real value rather than Facebook Marketplace speculation. You can also assess the seller's tank directly, which tells you a lot about how their equipment was maintained.
UV Sterilizers and RO/DI Systems
Two equipment categories that significantly affect water quality and livestock health are UV sterilizers and reverse osmosis systems.
A UV sterilizer passes water past a germicidal UV bulb and kills free-floating pathogens, parasites (at appropriate flow rates), and algae spores. Units like the Aqua Ultraviolet Advantage 25W and the Coralife Turbo-Twist 9W are common choices for tanks up to 125 gallons. For options suited to reef tanks specifically, the Best Uv Sterilizer for Reef Tank guide covers models with flow rate and wattage comparisons.
An RO/DI system produces the purified water you need for saltwater mixing and top-off. The BRS 4-Stage RO/DI and the Spectrapure systems are well-regarded starting points. For a thorough comparison of systems, the Best Rodi Unit for Reef Tank roundup includes output capacity, rejection rate, and value considerations.
Budgeting for a Complete Reef Setup
First-time reef keepers consistently underestimate startup costs. A realistic budget for a mid-size reef (50 to 100 gallons) buying mostly new:
| Equipment | Cost Range |
|---|---|
| Tank and stand | $300 to $1,200 |
| Sump | $100 to $300 |
| Return pump | $60 to $150 |
| Protein skimmer | $100 to $350 |
| Lighting (2 fixtures) | $300 to $800 |
| Heater | $40 to $80 |
| Powerheads / wavemakers | $80 to $300 |
| RO/DI system | $100 to $250 |
| Salt mix (initial fill) | $60 to $120 |
| Rock and sand | $100 to $250 |
| Test kits | $60 to $100 |
| Total | $1,300 to $3,900 |
Buying used equipment across the board can cut that total by 40 to 60 percent. A realistic used-only budget for the same size system is $700 to $1,500.
FAQ
What's the best reef equipment brand? There's no single best brand. Different manufacturers lead in different categories. Eheim and Sicce for return pumps, Reef Octopus and Bubble Magus for skimmers, AI and Radion for LED lighting, BRS and Spectrapure for RO/DI. Buy by category rather than committing to one brand for everything.
Is it safe to buy livestock online? Buying live fish, corals, and invertebrates online is common and generally works well with reputable vendors. Livestock.com, Unique Corals, and Reef2Reef's Reef2Reef Vendor section all have active markets. Always quarantine new arrivals before adding them to an established tank.
How do I negotiate on used reef equipment? Start by researching the current new price and deducting 40 to 50 percent for good-condition used equipment. Expect to negotiate down from the asking price on Reef2Reef and Facebook by 10 to 15 percent. Offering cash pickup often gets you an additional small discount.
What's the best time of year to buy reef equipment on sale? Black Friday is the biggest sales event in the hobby. Most major online retailers (BRS, Marine Depot) run 15 to 25 percent off site-wide promotions. Buying major equipment in November can save $200 to $400 on a full system purchase.
Summary
Reef equipment is available from dedicated online retailers, local fish stores, and a very active used market. Buy heaters and filtration media new. Sumps, stands, and protein skimmers are generally safe used with proper inspection. Set your budget before shopping, plan the full equipment list before buying anything, and factor in the cost of RO/DI water production and salt mix alongside the hardware costs. The used market on Reef2Reef and Facebook Marketplace can cut your startup cost dramatically if you're patient and inspect carefully before buying.