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Choosing a spot feels like the easy part. Once a tank is full, though, it is almost impossible to move, and a poor location causes algae, temperature swings and spills for as long as the tank runs.
Key figures
- about 83 lb Water alone in a 10-gallon aquarium
- about 334 lb Water alone in a 40-gallon aquarium
- about 626 lb Water alone in a 75-gallon aquarium
Weight first
Water weighs a little over 8 pounds per US gallon. A tank holds that plus glass, gravel, rock and equipment, so even a mid-sized aquarium weighs hundreds of pounds when full.
| Tank size | Water alone, approximately |
|---|---|
| 10 gallons | about 83 lb |
| 20 gallons | about 167 lb |
| 40 gallons | about 334 lb |
| 75 gallons | about 626 lb |
- 10 gallons83 lb
- 20 gallons167 lb
- 40 gallons334 lb
- 75 gallons626 lb
Water-only calculations shown in this article using its stated pounds-per-US-gallon basis. Glass, gravel, rock and equipment are excluded.
Use a stand designed for the tank, on a level floor. For large tanks on upper floors, place the stand across floor joists near a load-bearing wall, and ask a professional if unsure.
Avoid these spots
- Direct sunlight, which drives algae and heats the water
- Next to radiators, vents or fireplaces, which cause temperature swings
- Busy doorways, where knocks and vibration stress fish
- Over electronics or valuable flooring, in case of leaks and splashes
Practical checks
- An outlet nearby, ideally with a drip loop in each cord so water cannot run into the plug
- A route to a sink or drain for water changes
- Room above the tank to open the lid and work inside
- Space behind for the filter and heater cords
A stand that is not level puts uneven stress on the glass and seams. Check with a spirit level before filling.
The aquarium stand guide addresses the support beneath the tank. The water-change equipment budget includes the access needed for recurring maintenance.
Questions people ask
How much does a full aquarium weigh?
Water alone weighs a little over 8 pounds per US gallon. A 20-gallon tank holds about 167 pounds of water, plus glass, gravel and decor.
Can I put an aquarium near a window?
Avoid direct sunlight. It fuels algae and heats the water unevenly.
Can I use regular furniture as an aquarium stand?
Only if it is rated for the weight. Most furniture is not designed for hundreds of pounds on a small footprint.
Is an upstairs floor safe for a large tank?
Small tanks are usually fine. For large tanks, place the stand across joists near a load-bearing wall and get advice if unsure.
