You are placing a hatchling in this? 34x14 is narrow. (476 sq in) a 24x24 is 576 sq in so it is much bigger area and a better shape. 36x20 would be fine bit quite large for a hatchling and would take careful balance to have the animal settle in.
Does anyone have experience with these cages? Looks like they have the hard corners that kitedemon was saying are so difficult to clean, but they look like the best bang for your buck as far as size goes