I have a Pacman in a 10 gallon tank with live plants and I noticed the temperature is low in the tank now that it’s starting to get cold here. So I put a heat pad on the side of the tank and it doesn’t seem to make any difference at all. I’m considering putting a CHE on the tank, but what wattage and fixture would work best? I’ve been reading through the forums and I haven’t seen anybody using just regular low wattage heat bulbs, is there a reason for this? Thanks for any input