25 gallon tank: dimensions & setup math
24 × 12 × 20 inches (L × W × H). Rounded planning dimensions; measure your tank.
25 nominal gal · about 282.57 lb with water, estimated glass and 2-inch gravel.
Estimated working water uses 85% of nominal: 21.25 US gal. The volume tool instead applies 85% to geometric volume. Neither is a measured fill.
Eight answers for this tank
- Tank volume
24.94 US gallons · 94.39 litres
- Gravel & substrate
33.33 lb gravel for a 2-inch bed
- Heater wattage
75–125 W planning range
- Filter flow
100–150 GPH for a community
- Stocking guide
288 in² surface · 24-inch swimming length
- Water changes
5.31 US gal for a 25% water change
- Dechlorinator dose
2.5 mL Prime for 25 US gal of new water
- Filled weight
About 282.57 lb filled (without stand)
Plan around this footprint
This 25 gallon plan uses 24 × 12 × 20 inches and 288 in² of floor. Compared with the 20 gallon extra high (200 in²), its footprint is 44% larger. Small setup: leave an open swimming lane and add livestock in stages after the filter is cycled.
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.