Like others have said make sure to read the caresheet 2-3 time also look into a local Breeder if you want to see a snake before you buy one I am sure there are some close to you or try your local Herp socoiety for a possible addoption . I would get a 20G long for a first tank unless your buying a hatchling. A 20L would last your for at least a year or 2 and by then you will probally have switched to racks and own 5+ balls with thoughts of the sleepless nights worried about eggs and your gravid girls