BP are solitary animals and do not require companionship, there is absolutely no benefit in housing multiple BP in the same enclosure.

Common sense will tell you that your BP do not need to be together for various reasons that have been documented such as stress, going off feed, transmission of parasites and diseases, premature breeding, serious injuries, death, cannibalism, just not worth the risk

You don't have to take my word for it so here is a little reading

http://www.ball-pythons.net/forums/s...ltiple+housing

http://www.ball-pythons.net/forums/s...ltiple+housing

Now for your problem.

Have you taken your BP to a vet for a general health check, and did you have a fecal done.

I would recommend you take your BP to an herp vet if you are concerned and have a fecal done on both, here is how to find an herp vet in your area http://www.arav.org/USMembers.htm