Hi Laura, I'm sure you want complete honesty. Housing 2 beardies together all the time is not a good thing as they are very territorial, dominance issues, stress, injuries and deaths have occurred. We have read and seen many pictures of terrible injuries that have taken place and it can happen VERY quickly. Even though you would be trying to put them in a totally different tank than your male was in originally, if he is the alpha beardie, he will be the dominant one. If you do plan on breeding, then the best way to handle it would be to only put them together long enough for the breeding to take place, then separate them. If they are allowed to be in the same tank continuously, the male will breed with her non-stop and she won't be allowed to eat as much as she wants or even be able to bask when she needs to. Having them together when she is gravid could also cause her to become egg bound which is very dangerous and could kill her.
You do have every right to be nervous about putting them together. You would be much safer and they would both be much happier in their own tanks. I had 2 young beardies together for a short time before I knew any better (before I found this forum) and even though no injuries occurred, it was very obvious that the smaller of the two was very stressed out from it and I saw every sign of stress when I was told what to look for. Once they each got their own tanks, I couldn't believe the change in both of them.
Please consider all of this and if you want me to post pictures of some of the injuries that have occurred from 2 being housed together, let me know and I will share them with you. Thanks for asking about this ahead of time. :wink: