Compare 29, 40 breeder and 55 gallon aquariums
| Tank | Common planning dimensions | Water only | Editable empty glass estimate |
|---|---|---|---|
| 29-gallon | 30 × 12 × 18 in | 241.9 lb | 40 lb |
| 40-gallon breeder | 36 × 18 × 16 in | 333.6 lb | 58 lb |
| 55-gallon | 48 × 13 × 21 in | 458.7 lb | 78 lb |
The breeder format is wider front-to-back and lower than a typical 55-gallon tank. That changes stand fit, aquascaping room, access and how the same setup weight is spread across the footprint.
What the full-weight result includes
Inside the tank
Water, substrate, rock, driftwood, decor and livestock displacement assumptions.
Equipment and cabinet
Filter, lid, light, heaters, pumps, sump water, plumbing and the stand itself.
Support check
Stand rating, level contact, water damage, bowing, fasteners, floor condition and footprint.
Assumptions and editable defaults
- Fresh water uses 8.34 lb per US gallon; saltwater uses a 2.5% density increase.
- The 40-gallon breeder planning preset uses 36 × 18 × 16 inches and a 58 lb empty glass tank. Trim, bracing, overflow systems and brand specifications vary.
- The acrylic option applies an approximate lighter empty-tank preset; replace it with the manufacturer’s listed weight.
- Aqueon lists 40 Breeder among its standard glass rectangle aquarium sizes and advises using a stand able to bear the filled weight. The 36 × 18 × 16 in and 58 lb values here are editable planning defaults; verify the exact model. Aqueon standard aquariums.
40-gallon breeder aquarium weight questions
How much does 40 gallons of freshwater weigh?
About 333.6 pounds, or about 151 kilograms. This is water only.
How much does a complete 40-gallon breeder aquarium weigh?
With the editable defaults on this page, the tank, substrate, rock, equipment and stand bring the setup to about 547 pounds before the planning margin.
Can a regular dresser support a 40-gallon breeder aquarium?
Do not assume it can. Aquarium stands are designed around tank dimensions and load paths. Verify the actual support rating and construction before filling.