20 gallon long tank: size, liters and setup numbers
The 20 gallon long trades height for length. That extra floor space makes it a favorite for schooling fish, bottom dwellers like corydoras, shrimp, and breeding or quarantine setups.
| Typical dimensions | 30 × 12 × 12 in 76.2 × 30.5 × 30.5 cm |
|---|---|
| Volume | 20 US gallons 75.7 liters |
| Realistic water after substrate and decor | About 17 gal About 64.4 L |
| Water weight | About 167 lb About 76 kg |
| Gravel for a 1 inch bed | About 21 lb About 9 kg |
| Gravel for a 2 inch bed | About 42 lb About 19 kg |
| Heater (room 8°F / 4.4°C cooler) | 50 W |
| Heater (room 15°F / 8.3°C cooler) | 100 W |
| Filter flow (4 to 6 times per hour) | 80 to 120 GPH 303 to 454 L/h |
Dimensions vary a little between brands. For exact numbers, measure your tank and use the calculators below.
Plan the rest of your 20 gallon long tank
Common questions
- How many liters is a 20 gallon long tank?
- A 20 gallon long tank holds about 75.7 liters when filled to the brim. With substrate and decorations, the real water volume is usually closer to 64 liters.
- How much does a 20 gallon long tank weigh when full?
- The water alone weighs about 167 pounds (76 kg). Glass, substrate and rock add more on top, so choose a stand rated for the full weight.
- What size heater does a 20 gallon long tank need?
- If your room stays around 8°F below your target water temperature, a 50 W heater is a good fit. For colder rooms, around 15°F below target, go with 100 W.