well i dont own a corn, but i have... and i own a kingsnake. imo, i'd say go with a king. there are plenty of species of kingsnakes to choose from so you will be suited perfectly. i love my kingsnake, he's a banded califorinia king, about 6 months old. he requires hardly any care at all. all i really have to do for him is change the newspaper i use for substrate and the water every few days. they require barely no humidity at all, gradient temps of about 85... simple stuff, and awesome snakes. and your tank would be fine for a king.