40 gallon breeder tank: dimensions & setup math
36 × 18 × 16 inches (L × W × H). Rounded planning dimensions; measure your tank.
40 nominal gal · about 464.61 lb with water, estimated glass and 2-inch gravel.
Estimated working water uses 85% of nominal: 34 US gal. The volume tool instead applies 85% to geometric volume. Neither is a measured fill.
Eight answers for this tank
- Tank volume
44.88 US gallons · 169.9 litres
- Gravel & substrate
75 lb gravel for a 2-inch bed
- Heater wattage
120–200 W planning range
- Filter flow
160–240 GPH for a community
- Stocking guide
648 in² surface · 36-inch swimming length
- Water changes
8.5 US gal for a 25% water change
- Dechlorinator dose
4 mL Prime for 40 US gal of new water
- Filled weight
About 464.61 lb filled (without stand)
Plan around this footprint
This 40 gallon breeder plan uses 36 × 18 × 16 inches and 648 in² of floor. Compared with the 38 gallon (432 in²), its footprint is 50% larger. Medium setup: place equipment so water circulates along the full length, including behind hardscape.
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.