We've got Emi the little milksnake in a ten gallon but Beth added lots of cage decorations and climbing stuff so there's very little actual big open floor spaces. Emi's settled in very well and is eating and in shed again tonight so it seems it's fine for her. They do burrow a lot as Becky says and are escape artists so be careful on both those fronts.
Congrats on the new addition. Love the name!
~~Jo~~