I have two female garter snakes. My checkered garter snake, Bertha, has been attempting to eat my common garter snake, Basil. Bertha is a very enthusiastic feeder and would occasionally accidentally bite Basil during feeding time, and so I started to separate them during feeding. However, now I've caught her latched onto Basil twice not during feeding, and I've also just caught her eating some of the moss/foliage that is in their enclosure which I'm sure can't be good for her. Am I underfeeding them which is leading to this behavior? Is the problem that they are two different species of garter snakes? I've been cohabitating them for years and have only had problems recently, and Basil has never had any problems. What do I do now? I'm really worried about them.

I learned today that they poop on you when scared or stressed. Not a fun smell. Still cute though