Posted: Sat Sep 15, 2007 2:19 pm
I'd get a 100-watt one for a 20-gallon, although I think 100-watt Stealth's are rated to be used with even a somewhat larger tank. There is a dial to adjust the temp, I can't remember the min and max temps, but the range will accommodate your turtle's temp needs.
How big a tank do you intend to upgrade to? I used a 200-watt Stealth in a 40-gallon stock tank.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-