A full marine tank setup for sale typically includes the aquarium, sump, lighting, protein skimmer, return pump, circulation pumps, heater, and sometimes live rock and established live sand. Prices range from about $400 for a basic used 30-gallon FOWLR (fish only with live rock) setup to over $5,000 for a complete mixed reef with high-end LED lighting and established coral colonies. What you pay depends heavily on the included equipment quality, tank size, and whether the seller is pricing for a quick sale or trying to recover their investment.
This guide walks through what a complete marine tank setup includes, what prices look like by tank size, what to inspect before buying used, where to find setups for sale, and how to transport and restart a purchased system.
What a Complete Marine Tank Setup Includes
The Tank
Marine aquariums are sold in three primary configurations: standard rectangular glass tanks, rimless low-iron (Starphire) glass tanks, and acrylic tanks. Rimless glass and acrylic tanks are more expensive but provide better clarity and viewing angles. Common sizes for complete reef setups are 40 gallons (breeder), 75 gallons, 90 gallons, 120 gallons, and 180 gallons.
Reef-ready tanks have predrilled overflow boxes built into the back panel or corner that drain water to a sump below the tank. Non-reef-ready tanks require a hang-on-back overflow box (like the CPR CS50) to drain to a sump, which is less reliable. For a used marine setup, always verify whether the tank is reef-ready if a sump is included.
Sump
The sump is typically a 20 to 40-gallon tank situated in the cabinet below the display tank. It houses the protein skimmer, return pump, any chemical media reactors, and often a refugium section with chaeto macro algae for nutrient export. A sump increases total water volume, which stabilizes water chemistry.
Protein Skimmer
The protein skimmer is the most important piece of marine filtration equipment. It removes dissolved organic compounds before they break down into ammonia, working by creating a foam column that organic molecules cling to. Common reliable skimmers include the Reef Octopus Classic 110-SS (rated to 110 gallons, $200 to $250 new), the Bubble Magus Curve 5 ($120 to $160 new), and the Nyos Quantum 120 ($300 to $350 new). Used skimmers in working condition sell for 40 to 60% of new retail.
Lighting
Reef lighting is often the most valuable part of a complete setup and the component most worth evaluating carefully. Common premium LED fixtures include:
- EcoTech Marine Radion XR30 Pro: $600 to $700 new, $300 to $400 used. Covers a 24 x 24-inch area on a reef.
- AquaIllumination Hydra 64 HD: $500 to $600 new, $250 to $350 used. Similar coverage.
- Kessil A360X: $400 new, $200 to $250 used per fixture. Often sold in pairs for wider tanks.
- Orphek Atlantik V4: $900+ new. Less common but highly regarded for SPS reefs.
Metal halide lighting (older technology) still works but runs hot and has higher electricity costs. If a setup you're looking at has metal halides, factor in the cost of upgrading to LED if that's in your plans.
Return Pump and Circulation
The return pump moves water from the sump back to the display tank. Common reliable options include the Sicce Syncra 5.0, the Reef Octopus Varios series, and the EcoTech VarioS-6. Circulation pumps inside the display tank (Koralia, Tunze, or EcoTech Vortech MP40) provide the random flow reefs need.
Heater
Two 150-watt heaters in parallel are standard for 75 to 120-gallon reefs. The Eheim Jager and Aqueon Pro are reliable choices. Some setups use an external inline heater on the sump return line for more precise temperature control.
Prices by Tank Size
These are realistic prices for complete, working used setups in fair to good condition:
| Tank Size | FOWLR (Fish Only) | Mixed Reef | SPS Display Reef |
|---|---|---|---|
| 30 to 50 gallons | $300 to $600 | $500 to $1,200 | $800 to $2,000 |
| 75 to 90 gallons | $600 to $1,200 | $1,200 to $2,500 | $2,000 to $4,000 |
| 120 to 150 gallons | $1,000 to $2,000 | $2,000 to $4,000 | $3,500 to $7,000 |
| 180+ gallons | $1,500 to $3,000 | $3,000 to $6,000 | $5,000 to $10,000+ |
These ranges assume no fish or coral are included. Established reef ecosystems with significant coral growth add considerably more value, but pricing coral accurately requires specific knowledge of species and growth rates.
Where to Find Full Marine Tank Setups for Sale
Local Reef Clubs
Local reef clubs are the best starting point. Search for your city plus "reef club" or "reef aquarium society." Club members sell complete setups when relocating, having children, or simply leaving the hobby. Prices at club events are often below Craigslist because sellers prioritize finding someone who will care for the system well over maximizing price.
Reef2Reef Classifieds
Reef2Reef (reef2reef.com) classifieds is the largest online marketplace for used reef equipment in North America. The site has regional filters so you can find local listings that make pickup practical. Equipment-only listings (lights, skimmers, pumps) can be shipped, but complete tank systems require local pickup.
Craigslist and Facebook Marketplace
Search "reef tank," "saltwater aquarium," or "complete reef setup." Prices vary widely and negotiation is common. Be cautious of listings where the seller says they're leaving the hobby and needs to sell quickly at a deep discount. Sometimes this signals equipment problems or a disease issue with the livestock.
Aquatic Experience and MACNA
Aquatic Experience (an annual aquarium trade show in Chicago area) and MACNA (Marine Aquarium Conference of North America) occasionally have complete setup sales or know-someone referrals. These events attract serious hobbyists who are upgrading, which means higher-quality equipment for sale.
For a detailed breakdown of specific equipment categories, our Best Aquarium Equipment guide covers protein skimmers, LED lighting, and circulation pumps with side-by-side comparisons.
What to Inspect Before Buying
Glass and silicone: Check all four bottom corners and the base plate seams for any silicone separation, yellowing, or brittleness. Run your fingernail along the silicone seams. Any area where the silicone is lifting away from the glass is a potential leak. Don't buy a tank with compromised silicone unless you're planning to reseal it yourself.
Livestock quarantine: If the tank has fish or coral, ask about disease history. Marine ich (Cryptocaryon irritans) and velvet (Amyloodinium) can lay dormant for 72 days without a host. Ask directly whether the system has ever had an ich outbreak. If you're buying livestock-included, a fallow period or quarantine is essential before adding any new fish.
Pump wear: Run every pump before you commit. A return pump or circulation pump with worn bearings will rattle or hum unusually. This indicates imminent failure.
LED driver function: Ask the seller to run lights at full intensity and through their color channels. Flickering, partial channel failure, or inability to hold settings indicates driver degradation.
Skimmer calibration: A protein skimmer should be producing a wet foam in the collection cup. Ask the seller to demonstrate it running. A skimmer that's been sitting dry may need break-in time to produce skim properly, but at least verify the pump runs and air intake is clear.
Previous chemistry: If possible, ask for the seller's recent water test results. Elevated nitrate (above 40 ppm) or phosphate (above 0.1 ppm) that's been chronic can indicate a system that's been struggling.
Transporting and Restarting a Purchased Setup
Moving a full marine tank is a significant logistical operation. A 90-gallon tank filled with saltwater weighs over 900 pounds. Plan to drain the tank before moving it.
Preserve beneficial bacteria: Package the live rock in buckets or coolers with tank water and a battery-powered airstone. Beneficial bacteria can survive 24 to 48 hours in a well-oxygenated container.
Keep fish in buckets: Use the original tank water and a battery airstone. Minimize time in transit.
Keep parameters stable: Mix new saltwater at home to the same salinity as the original system (measure with a refractometer). Don't perform a large water change during the transfer.
Test before adding livestock: After the system is reassembled and running, test ammonia, nitrite, nitrate, and salinity before adding fish and coral back. Even with careful transfer, some die-off of bacteria can cause a mini cycle.
FAQ
How much should I budget for a complete used marine tank setup?
For a working 75-gallon reef with quality lighting and a protein skimmer in fair condition, budget $1,200 to $2,000. For a 120-gallon mixed reef with premium LEDs, budget $2,500 to $4,000. These prices assume no coral or fish included. If established coral colonies are part of the deal, the value goes up significantly but also requires more careful evaluation.
Is it better to buy a complete setup or piece it together?
Buying a complete used setup is almost always cheaper than buying new components separately, often by 40 to 60% off new retail. The trade-off is dealing with compatibility between components chosen by someone else and the risk of one piece being in poor condition. If you buy piece-by-piece from a reef club's used market, you can cherry-pick quality components but it takes more time.
What's the most important thing to check on a used marine tank?
The silicone seams. A leak in a 90-gallon marine tank is catastrophic. Inspect every seam carefully. If anything looks questionable, walk away or factor in a full reseal ($100 to $200 in materials and time) before setting it up.
Can I set up a marine tank without a sump?
Yes. A hang-on-back protein skimmer like the AquaC Remora or the Reef Octopus BH-90F can run on tanks without sumps. This simplifies the setup but reduces water volume and limits your filtration options. For a fish-only system under 50 gallons, sumps are optional. For a reef with significant coral, a sump adds meaningful stability.
Final Thoughts
A full marine tank setup for sale is a significant purchase that rewards careful inspection. The lighting and protein skimmer are the two most valuable components and the ones most worth evaluating carefully. Test everything running before you hand over money, check the silicone seams thoroughly, and ask direct questions about disease history in the tank. A well-maintained used setup from a serious hobbyist at fair market value is one of the best deals in the aquarium hobby. Our Top Aquarium Equipment guide has detailed breakdowns of marine equipment categories if you want to verify whether a setup's components are worth the asking price.