About This Tool
### Stop Freezing (or Cooking) Your Fish
A reliable heater is the heart of a tropical aquarium.
* **Too Small**: The heater runs 24/7, burns out early, and can't keep the tank warm in winter.
* **Too Big**: It cycles on/off constantly (wearing out the switch) or cooks the fish if it gets stuck "ON".
**Heater Size Calculator** finds the "Goldilocks" wattage based on your room temperature.
### The "Watts per Gallon" Myth
The old rule was "5 watts per gallon". **This is often wrong.**
A tank in a cold basement (60°F) needs DOUBLE the power of a tank in a warm living room (72°F). Our tool calculates this "Heat Delta".
Key Features
- **Ambient Temp Logic**: Calculates power based on how cold your room gets.
- **Safety Recommendation**: Suggests using 2 smaller heaters for large tanks (Redundancy).
- **Wattage Matching**: Matches results to standard heater sizes (50W, 100W, 300W, etc.).
Frequently Asked Questions
Why use two heaters?
For large tanks (55g+), using two smaller heaters is safer. If one fails ON, it won't cook the tank. If one fails OFF, the other keeps the water from freezing until you buy a replacement.
Where should I place the heater?
Place it near high water flow (like the filter outlet). This ensures heat spreads evenly throughout the tank instead of creating a hot spot.
Can I use a bigger heater than recommended?
It's risky. A powerful heater can raise the temperature very fast if the thermostat breaks. Stick to the recommended size or use an external temperature controller.