I have limited experience with tubs, but have found that ambient room temps are key with tubs. If your ambient room temps are below 75F, you're better off going with something else.
So you're looking at some kind of an oil heater in that case?
I'm a fish guy with a girlfriend and 2 young boys who live reptiles and fish.
2015 Male Pastel Ball Python 610 grams - Damien (updated 4/24/2016)
2013 Male Gargoyle Crested Gecko - Ethan