It's just a bad idea. You're putting them in a situation where they have to compete for everything...favorite hide, favorite cool spot, favorite warm spot, etc. Even in a big cage, they will feel pressure from the other BP.
Some people do keep mutipule BP's in the same cage, and some will no doubt chime in on the subject, but it's not a standard practice, and should be avoided.
Please don't tell me your feeding them both in the same enclosure?