hi there, i used to have a couple of garters when i was younger, but i never had any problems when it came to dinner time. what are you feeding him/her? and the most comman problems for a snake to go of feed is wrong temperatures/humidity. my Brb often refuses to eat so i have to play around and iv found that he likes it cooler than most. it could also be that the viv is to big? two months isnt much to worry about anyway but good luck.