120 Gal Tank Buying Guide: Aquariums, Propane & Water Uses

A 120-gallon tank is a standout choice for aquarium enthusiasts seeking the perfect blend of size, versatility, and aesthetic impact. Ideal for both freshwater and saltwater setups, this spacious tank allows for vibrant aquatic communities and stunning aquascapes. Our shopping guide covers everything you need to know—helping you find the best 120-gallon tank to elevate your home or office space.

120 Gallon Tanks: Types, Variations, and Applications

120 gallon tanks are versatile large-capacity containers used primarily in the aquarium hobby to house freshwater or saltwater fish, reefs, aquascapes, and other aquatic pets. They are also used in industrial and residential settings as propane tanks or water storage units. Choosing the right 120 gal tank depends on your intended use, preferred material, and specific features.

Below is a comparison of the main types and applications:

Type	Common Use	Material	Typical Features	Applications
Aquarium (Standard)	Home Fishkeeping	Glass/Acrylic	Rectangular, rimmed, overflow	Fresh/saltwater, aquascaping
Aquarium (Reef-Ready)	Saltwater/reef setups	Glass/Acrylic	Built-in overflow, drilled	Marine, reef aquariums
Custom Aquarium	Custom projects, displays	Glass/Acrylic	Any shape/feature possible	Unique biotope, show tanks
Propane Storage Tank	Fuel storage/heating	Steel	Heavy-duty, ASME rated	Residential, commercial fuel supply
Water Storage Tank	Water supply	Plastic/Steel	Corrosion-resistant, insulated	Residential/commercial storage

Everyday Usage of 120 Gallon Tanks

Aquariums

A 120 gallon fish tank serves as a spacious aquatic environment, suitable for:

Housing diverse fish species, especially larger ones or those needing more space to swim.
Developing intricate aquascapes with live plants, rocks, and driftwood.
Maintaining stable water conditions due to the larger volume (diluting waste, more consistent parameters).
Setting up stunning reef aquariums with corals, marine fish, and invertebrates.
Providing ample room for breeders, community tanks, or specialized biotope setups.

Propane/Waste Storage

A 120 gal propane tank is intended for:

Providing fuel for home heating, commercial kitchens, backup generators, or agricultural use.
Holding enough propane for long-term use without frequent refilling.

Water or liquid storage tanks of this size:

Serve for residential or commercial water storage (e.g., rainwater harvesting, emergency supply).
Are also utilized in industries needing moderate quantities of non-potable water.

Benefits of a 120 Gallon Tank

For Aquarists

Ample Space: Supports a greater biodiversity of fish/aquatic life and reduces territorial disputes.
Enhanced Visual Impact: Large tanks have a commanding presence, making an impressive display.
Water Stability: More water volume means less fluctuation in parameters, benefiting sensitive species.
Versatility: Accommodate both beginner and advanced aquarists; suitable for freshwater, saltwater, or reef systems.
Design Flexibility: Size allows for custom aquascapes, larger structures, and complex filtration.

For Propane/Water Users

Extended Supply: Reduces refilling frequency and risk of running out.
Efficiency: Can fuel multiple appliances or applications simultaneously.
Safety and Regulations: ASME certification (for propane) ensures reliability and complies with most codes.
Durability: Built to withstand harsh environments and provide long-term service.

How to Choose a 120 Gallon Tank

For Aquariums

Consider the following criteria to select the best 120 gal aquarium for your needs:

Material
Glass: Heavier, more scratch-resistant, traditional; often less expensive.
Acrylic: Lighter, more impact-resistant, better clarity, but scratches more easily.
Shape
Rectangular: Most common, easy to find stands, and best suited for active swimmers.
Cube: Better for creative aquascaping or certain reef setups.
Custom shapes (Pentagon, Bowfront, etc.): Allow for specialized designs or display needs.
Features
Reef/Overflow-Ready: Pre-drilled holes, built-in overflow for advanced filtration and sumps.
Rimless vs. Rimmed: Rimless tanks offer a sleek, modern look; rimmed tanks are often more structurally secure.
Stand Compatibility: Check dimensions and weight capacity before buying a stand or canopy.
Dimensions
Standard 120-gal: commonly 48″ L x 24″ W x 24″ H, but varies (verify before buying).
Ensure it fits your space and planned installation site.
Brand & Build Quality
Reputable brands (e.g., Aqueon, Marineland, Clear-For-Life, Perfecto) offer quality assurance and warranties.

For Propane/Water Storage

Material: Steel for propane (heavy-duty, pressure-rated); plastic or steel for water.
Certification: For propane, ensure it’s ASME-rated.
Installation: Some tanks require professional installation and must comply with local codes.
Accessories: Check for essential fittings (POL, fill valve), regulators, and gauges.

Practical Tips and Best Practices

Installation Tips

Place tanks on a level, sturdy surface to avoid stress or leaks.
For aquariums, use a proper stand—never place a glass tank directly on the floor.
Propane tanks must be situated according to local fire and building codes, often at a minimum distance from structures.

Use and Maintenance

Perform routine water changes for aquariums (10-20% weekly) to maintain water quality.
Check for leaks, scratches, or defects in acrylic tanks regularly.
For reef aquariums, maintain proper salinity and monitor for evaporation.
For propane tanks, inspect for corrosion and test valves periodically.
Ensure all tanks are cleaned with appropriate materials; avoid harsh chemicals that may compromise tank integrity or aquatic life.

Safety

Never move a filled glass aquarium without draining it first!
Propane tanks should remain upright and never be stored indoors.
Keep aquarium electrical equipment (heaters, lights, filters) away from spill hazards.

Maximizing Utility

Use overflow and sump systems in reef-ready aquariums to increase water volume and hide equipment.
Choose modular filtration for easy maintenance and upgrading.
Plan aquascapes and livestock around the tank’s shape and access points.

120 Gallon Tank Models: Technical Specification Comparison

Model/Brand	Dimensions (L x W x H)	Material	Features	Included/Optional	Typical Price Range
Marineland 120 gal w/ Overflow	48″ x 24″ x 24″	Glass	Overflow, plumbing kit	Stand, lid, light optional	$900+
Clear-For-Life 125 gal (Rect)	60″ x 18″ x 24″	Acrylic	Scratch-resistant	Lifetime warranty	$1200+
Aqueon LED Ensemble (120 gal)	48″ x 24″ x 25″	Glass	LED lighting, stand	Stand & lights included	$1000+
SC Aquariums Starfire 120 gal	48″ x 24″ x 24″	Glass	Starfire glass, eurobrace, overflow	Plumbing kit	$1100+
Custom Glass 120 gal (FishTankBank)	48″ x 24″ x 25″	Glass	Aluminum frame, custom	Crated for shipping	$900+
Clear-For-Life 120 gal Cube	30″ x 30″ x 31″	Acrylic	Modern look, room for aquascape	Lifetime warranty	$1200+
Propane ASME 120 gal	Varies (~44″ L x 24″ Dia)	Steel	POL/Fill valves, ASME cert	Multi-valve assembly	$1499+

Note: Actual prices and dimensions can vary; always check the latest specifications from the manufacturer or retailer.

Conclusion

A 120 gallon tank is a substantial, flexible choice—whether you’re a serious aquarist looking to create a stunning aquatic ecosystem or in need of reliable fuel or water storage. With spacious dimensions, enhanced stability, and the ability to house a wide variety of aquatic life or meet industrial/residential storage needs, these tanks deliver exceptional value. By understanding the types, features, and usage best practices, you’ll ensure many years of safe, efficient, and visually striking enjoyment or function from your 120 gal tank.

FAQ

What are the ideal dimensions of a 120 gallon aquarium tank?
Most standard 120 gallon aquariums measure approximately 48″ long x 24″ wide x 24″ high, though some cubes or specialty tanks may have different proportions.
Is it better to get a glass or acrylic 120 gal aquarium?
Glass is heavier, more scratch-resistant, and less expensive, while acrylic is lighter, clearer, and more impact-resistant but scratches more easily. Both are excellent; your choice depends on priorities like weight and appearance.
Can I use a 120 gallon tank for both freshwater and saltwater setups?
Yes, 120 gal tanks are highly versatile and suitable for both freshwater and saltwater (marine or reef) aquariums.
Do I need a special stand for a 120 gal tank?
Yes, due to the tank’s weight (potentially 1400 lbs filled), you need a stand specifically rated to support this size. Ensure your floor can also bear the load.
What filtration system is recommended for a 120 gal aquarium?
Canister filters, sump systems, or high-capacity hang-on-back filters are popular. For reef setups, a sump with integrated filters, heaters, and skimmers is recommended.
How many fish can I keep in a 120 gal aquarium?
Stocking depends on fish size and type, but generally, you can comfortably house larger species or a diverse community, provided proper filtration and water changes are maintained.
How much does a 120 gal propane tank weigh and what is it used for?
An empty 120 gal propane tank weighs around 300 lbs and holds up to 96 gallons of propane (liquid fill). It’s used for residential or light commercial fuel storage.
Are 120 gal tanks difficult to maintain?
Larger tanks often require more upfront work—such as water changes and equipment maintenance—but are more stable, making regular care easier once routines are established.
Can I move a 120 gal tank once it’s set up?
Never move the tank when filled. To move, drain all water and remove decorations and substrate to prevent structural damage.
Do 120 gallon tanks come with lids, lights, or plumbing equipment?
Some packages include stands, lids, lighting, or overflow/plumbing kits, while others are “tank only.” Always check what’s included and what accessories you’ll need to purchase separately.

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