Keeping more than 1 snake in the same tank...

[Reinz]

Short answer? DON'T DO IT.

Longer answer? There are a list of cons an arm long. Pros? Nothing I can say in a civil manner that won't come across as insulting and/or get me an infraction notice. Yes, some experienced keepers will swear by it. Key word here - 'Experienced'. I personally would never advice someone to do so.

Some food for thought -

If one snake gets sick, the other one will be exposed. You may not even be able to tell which one is sick.
Snake's are solitary creatures. They do not want - or need - company from another snake. And they certainly are not 'cuddling'.
There will be a constant battle for dominance over the choice spots.
There will be constant stress for both snakes.
It wouldn't be safe to feed them in the enclosure, which means moving to feed which ALSO leads to an arm's length list of WHY WOULD YOU WANT TO DO THAT???
Cannibalism. It happens. And size difference does NOT make a difference. Snakes of the same size can even give it a go. Usually both snakes end up dead.
Same sex rape as a show of dominance. Which will leave the non-dominant male potentially unable to breed in the future due to damage.
Undersized breeding if the snakes are male/female. Which could lead to your female being egg bound, dying, etc.
You'll never know who regurged, should that occur.

But hey, don't take my word for it. Someone much more eloquent wrote up an article you can read here.

Edit:

Just an additional note. People can say they don't have problems co-habbing all they want. The reality of it is it's 'fine' right up until its not, and by the time its not it's to late and now you've got a much bigger problem on your hands. Besides - what humans perceive as 'fine' in our terms is not 'fine' in snake terms.

Think you used enough dynamite there Butch?