Originally Posted by maxwellag
Good point... I will get that one instead. But what if it makes my tank too warm?
Well I don't think any heater can make your tank to warm, unless it malfunctions.
A heater has a thermostat, you set it to say 80 degrees Fahrenheit, the tank water is at 72 degrees Fahrenheit. The heater will come on and heat the water until the temperature reaches 80 degrees Fahrenheit , once it reaches the set temperature it will automatically shut off, only coming back on to warm it up back up to 80 degrees.
So all a higher watt heater will do is heat up the water quicker, but you don't want to over do it and get per say a 400 watt heater