40 gallon breeder tank: size, liters and setup numbers
The 40 gallon breeder is wide and shallow, with a deep front to back footprint. That makes it great for aquascaping, larger groups of fish, and bottom dwellers that need floor space.
| Typical dimensions | 36 × 18 × 16 in 91.4 × 45.7 × 40.6 cm |
|---|---|
| Volume | 40 US gallons 151.4 liters |
| Realistic water after substrate and decor | About 34 gal About 128.7 L |
| Water weight | About 334 lb About 151 kg |
| Gravel for a 1 inch bed | About 37 lb About 17 kg |
| Gravel for a 2 inch bed | About 75 lb About 34 kg |
| Heater (room 8°F / 4.4°C cooler) | 100 W |
| Heater (room 15°F / 8.3°C cooler) | 200 W |
| Filter flow (4 to 6 times per hour) | 160 to 240 GPH 606 to 908 L/h |
Dimensions vary a little between brands. For exact numbers, measure your tank and use the calculators below.
Plan the rest of your 40 gallon breeder tank
Common questions
- How many liters is a 40 gallon breeder tank?
- A 40 gallon breeder tank holds about 151.4 liters when filled to the brim. With substrate and decorations, the real water volume is usually closer to 129 liters.
- How much does a 40 gallon breeder tank weigh when full?
- The water alone weighs about 334 pounds (151 kg). Glass, substrate and rock add more on top, so choose a stand rated for the full weight.
- What size heater does a 40 gallon breeder tank need?
- If your room stays around 8°F below your target water temperature, a 100 W heater is a good fit. For colder rooms, around 15°F below target, go with 200 W.