I keep my snakes and mouse breeders in the same room and have never had any problems. I am sure many will say to seperate them, and I would If I had the opportunity, but I dont. I have yet to be bitten by any of my snakes (bp,corn, gopher, garter). I had my corn and bp about 8 months before I brought breeder mice in, and had nothing happen at that point. I am fairly new to the herp world though, so take that in consideration with my opinion.