Q. will 2 corns fight?
A. not usually, but it's really best to keep yuour snakes housed separately. this lowers the chance of both of them suffering from the same disease or parasites, and it is also more "natural" for snakes to live alone except for the brief periods they get together for mating (i.e. living with other snakes is stressful for them.)
Q. can you breed any morph with any morph?
A. yes - they are all the same species, however most "morphs" are the result of recessive genes (so you can't breed a snow from an amel and an anery - you'd get normals het for snow instead.) For a corn genetics tutorial, cruise to serpwidgets page! (It's linked from my links page.)
Q. would it affect the snakes to be housed together?
A. definately. you absolutely don't want a female getting pregnant before she's a good 3' long (and not when she's skinny, either.) If she becomes gravid too young she can become egg-bound which can be deadly.
^Curtis