What can go together with a red-sided? For instance (random) can a plains go with one? Northwesterns? I know easterns can but that's all I'm sure of.

And I know to stay away from wandering garters (cannibalism)

I don't really plan on getting one anytime soon (just got one), but just in case, I might buy one to get this new one eating, or for whatever reason, I want to make sure.