I know there are people here that cohabitate successfully, but the way I had heard it explained sounded like you basically needed an enclosure the size of two put together (how big is the tank you have them in?), with lots of different hides (a single snake needs 2 hides, a warm and a cool) and multiple hotspots (I see the heating pad behind them in one picture, they're probably both trying to get into a warm spot, if that's the only one you have). Plus with your size difference, the bigger one eating (or just killing) the smaller one is very possible.

I know you may think you're saving money by putting them together, but you aren't. Bite the bullet here and set up a second enclosure.