20 gallon high tank: size, liters and setup numbers
The 20 gallon high has a small footprint and a taller water column. It fits on smaller stands and shows off taller plants, but it has less swimming length than the 20 long, which matters for active schooling fish.
| Typical dimensions | 24 × 12 × 16 in 61 × 30.5 × 40.6 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 17 lb About 8 kg |
| Gravel for a 2 inch bed | About 33 lb About 15 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 high tank
Common questions
- How many liters is a 20 gallon high tank?
- A 20 gallon high 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 high 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 high 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.