No tank is too big for a garter snake, they love to explore!
But it might be too big for you if you are working with limited space in your home. Also keep in mind that you will have to be cleaning that tank on a regular basis.
It also helps to have someone who can help you move it around. It takes myself and 2 13yo boys to move the empty 75 I have. On the stand, I can barely drag it around on my own!
Theresa in Indy
1.0 T marcianus, 1.1 dogs, 1.0 cat, 2.0 skin kids