20 gallon extra high tank: dimensions & setup math
20 × 10 × 24 inches (L × W × H). Rounded planning dimensions; measure your tank.
20 nominal gal · about 218.95 lb with water, estimated glass and 2-inch gravel.
Estimated working water uses 85% of nominal: 17 US gal. The volume tool instead applies 85% to geometric volume. Neither is a measured fill.
Eight answers for this tank
- Tank volume
20.78 US gallons · 78.66 litres
- Gravel & substrate
23.15 lb gravel for a 2-inch bed
- Heater wattage
60–100 W planning range
- Filter flow
80–120 GPH for a community
- Stocking guide
200 in² surface · 20-inch swimming length
- Water changes
4.25 US gal for a 25% water change
- Dechlorinator dose
2 mL Prime for 20 US gal of new water
- Filled weight
About 218.95 lb filled (without stand)
Plan around this footprint
This 20 gallon extra high plan uses 20 × 10 × 24 inches and 200 in² of floor. Compared with the 20 gallon long (360 in²), its footprint is 44.44% smaller. Small setup: leave an open swimming lane and add livestock in stages after the filter is cycled. The column shape adds height rather than swimming length; reach and gas exchange deserve attention.
Dimensions and limits
Aqueon size chart. Listed dimensions are representative, not exact catalog measurements. Names identify marketed sizes; geometry explains why the calculated gallons can differ. Weight excludes the stand, rocks and equipment.