15 gallon column tank: dimensions & setup math
13.75 × 13.62 × 25 inches (L × W × H). Rounded planning dimensions; measure your tank.
15 nominal gal · about 174.3 lb with water, estimated glass and 2-inch gravel.
Estimated working water uses 85% of nominal: 12.75 US gal. The volume tool instead applies 85% to geometric volume. Neither is a measured fill.
Eight answers for this tank
- Tank volume
20.28 US gallons · 76.75 litres
- Gravel & substrate
21.68 lb gravel for a 2-inch bed
- Heater wattage
45–75 W planning range
- Filter flow
60–90 GPH for a community
- Stocking guide
187.34 in² surface · 13.75-inch swimming length
- Water changes
3.19 US gal for a 25% water change
- Dechlorinator dose
1.5 mL Prime for 15 US gal of new water
- Filled weight
About 174.3 lb filled (without stand)
Plan around this footprint
This 15 gallon column plan uses 13.75 × 13.62 × 25 inches and 187.34 in² of floor. Compared with the 15 gallon (288 in²), its footprint is 34.95% 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.