Heating is one of th main reasons I don't appreciate small tanks. And have virtually no use for them at all.......there are quite a few optional heaters that have a quite good use in smaller tanks around 1 gallon, that can also be used in larger tanks..........I would get a tetra 50 watt submersible non-adjustable heater, this heater works magnificently and can be used in a larger tank when you upgrade him. The maximum tank Size I would put it in is about 5 gallons though......another magnificent heater that will work quite effeciently, and effective is the hydor mini heater........just as a rule of thumb, most heaters go by the rule of 1 watt per liter....in US measurements there are about 4 liters in a gallon but approximately 3.7 liters in a gallon. For a one gallon I would use about double that for ensured heating due to there small size and capacity so using about an 8 watt heater should suffice so if you coul find another one that would be great
Last edited by Mo; 04-21-2012 at 08:53 AM.