Is that a 20 long? Sounds about like those dimensions. Besides a BP, there aren't many "big" snakes that can stay in a 20L. A female KSB, maybe a Caulker Cay Boa or Male Hog Island Boa. Depends. Some Hogs get bigger than others and might need a bigger tank. Um, a female Hognose can get to a decent size and they are adoooorable!