So... me OBSERVING my snakes have stress caused regurges and eating one another doesn't constitute EVIDENCE? What planet are you on, again? Because here on Earth, part of the scientific method includes observation to prove or disprove your hypothesis. Here, let me run through the process for you so you can see how I came to my conclusion that cohabbing is bad. And YES, the tanks were MORE than big enough for 2 baby corns (29 gallons). I'll even throw Beth's experience into the fray just to increase the data.
Hypothesis: Cohabitating a non-social animal may cause the early death of an animal due to stress induced feeding issues, breeding too young, or cannibalism.
Experiment: Cohabitate 2 snakes, and observe the effects on their behavior.
Observations: In case #1, stress from cohabitation and exhibited dominance caused regurgitations and feeding issues in the submissive animal, subject B. Animal was separated after regurgitation to prevent death of animal. In case #2, subject A ate subject B. In case #3, subject A bred to subject B at an age too young for subject B, causing egg-binding and eventual death.
Conclusion: Cohabitation of non-social animals CAN cause early death of an animal due to stress-induced feeding issues (including regurgitations), cannibalism, and/or breeding too young.