2.5 Gallon tank dimensions
12×6×8inches
Length × width × height. In metric, 30.5 × 15.2 × 20.3 cm.
A standard 2.5 gallon aquarium is 12 inches long, 6 inches front to back and 8 inches tall. Its measurements work out to almost exactly the volume on the label. Once you add gravel and leave a gap at the top, expect a little less water than that.
How much a 2.5 gallon tank weighs
Empty, the glass tank weighs about 4 pounds. Filled with water and two inches of gravel it comes to roughly 33 pounds, before rocks, wood or equipment.
A weight like this is fine on any sound floor, but it needs a stand built for aquariums: ordinary furniture is not made for a load that never moves.
| Empty tank | about 4 lb |
|---|---|
| Water (2.5 gallons) | 21 lb |
| Gravel, 2 inches deep | about 8 lb |
| Filled, with gravel | about 33 lb |
| Load on the floor | about 65 lb per sq ft |
Stand, lid, heater and filter sizes
The stand and the lid both follow the footprint, 12 by 6 inches. A stand has to support the whole bottom frame, so it can be bigger than the tank but never smaller.
For a heated tropical tank, a 25 W heater suits a normal room. Pick a filter rated to turn the water over four to six times an hour.
| Footprint | 12 x 6 in (0.5 sq ft) |
|---|---|
| Volume | 2.5 gal (9.5 L) |
| Heater | 25 W |
| Filter flow | 10 to 15 gal per hour |
| Typical glass | about 1/8 in thick |
What fish can live in a 2.5 gallon tank
How many of each fish would fill this tank on its own. Mix species and the numbers come down, so plan a real community with the calculator.
None of the popular fish we checked suit a tank this small. It works for shrimp and snails.
Too big for this tank
- Betta needs a bigger tank: the recommended minimum is a 18 x 12 in footprint.
- Neon tetra needs a bigger tank: the recommended minimum is a 24 x 12 in footprint.
- Ember tetra needs a bigger tank: the recommended minimum is a 18 x 12 in footprint.
- Guppy needs a bigger tank: the recommended minimum is a 18 x 12 in footprint.
- Harlequin rasbora needs a bigger tank: the recommended minimum is a 24 x 12 in footprint.
- Zebra danio needs a bigger tank: the recommended minimum is a 35 x 12 in footprint.
Gear for a 2.5 gallon tank
Searches on Amazon for the right size. Check the tank size or flow rating on the listing before you buy.
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