Heater Sizing
Watts = 5x gallons. 50 gallon = 250W heater.
Or use two smaller heaters for redundancy: 50 gallon = 2x 150W.
Temperature Targets
Standard tropicals: 78-82°F.
Discus / sensitive cichlids: 82-86°F.
Goldfish: 65-72°F (room temperature usually fine).
Coldwater (Arowana?): 75-80°F.
Chiller Necessity
Hot summers: chillers prevent dangerous overheating.
Cold-water tanks need them in summer.
Cost: $200-1000.
Emergency Backup
Battery-powered air pumps for power outages.
Backup heater (in storage).
Insulating blankets for sudden cold snaps.
- ✦Replace heaters every 3-4 years preventively
- ✦Stick-on temperature strips fail — use real digital thermometer
- ✦Test heater accuracy with known reference thermometer