Planted Tank Guru
Join Date: Dec 2002
Location: Portland Orygun
How big of a tank is it and how much do you need to raise the temp?
The second heater is going to have to be a bigger than the 200 watts you have now. So IMHO you might was well get a bigger heater if you need one. The price difference between a second 200 watt and say a 300 watt is only a couple of bucks.