Snakes I WOULDN'T call calm, but fit your other needs
- Milk Snakes
- King Snakes
All the above, in my experience, tend to be active at the very least, if not flighty even as adults.
Species i would look at if I were you:
- Corn Snakes
- Hognose Snakes
Childrens or Spotted Pythons may also be a good choice, but I have no experience keeping them myself. In particular, I don't know what kind of humidity they may require, and they probably like temperatures high enough that it would be difficult at least for ME to manage with a screen top, living in Minnesota.
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