any idea what type of wattage i would need to heat a 30 gallon tank. the one they are both in now is a 30 gallon.. The one we are purchasing over the next couple of days is also a 30 gallon. And does it matter if it's white or infrared. will it make a difference or hurt either of them if i use an infrared ones.. from what i found, the infrared ones are cheaper by like 10$.. and while being in the process of being a house and getting a completely second setup, 10$ is 10$ know what i mean.