I'll leave the great sand debate alone for now except to say that I am firmly anti-sand, at least it's better than the calcicrap though. I'll also leave your post up top alone and just say here that asking oppinions from 'pet' people can be dangerous and I would also explore their experience level to go with their experiences... here's some of mine because I'm sure you're wondering 'who the hell is this guy to pop out of no where and throw around advice' lol. Actually I'm not new although PH is probably the only one that would remember me. I used to be very active on this board back when it was much more popular and had many more breeders on it (I'll leave out why we all disbanded in the interest of fresh start and all, although it is still a thorn in my side), I had really just stopped by to see a pic of Matts baby and couldn't believe some of the bs answers that were being given for some very basic questions so I decided to answer a few. I have owned numerous reptiles over the past 20 years and been professionally breeding for the last 12. I have literally bred thousands of beardies alone and have several years experience with them. In most cases I tend to error on the side of caution as far as husbandry is concerned when I give advice.
As far as your female goes, even if he doesn't outright kill her she is still in a huge danger by being with him. She is hitting sexual maturity (if she hasn't already) and he WILL breed her. She should not be bred at this early of an age, minimums are 18 months and 350 grams (you could cheat a little on that but not this much). Because of sperm retention even if she made it through the first clutch I seriously doubt that she would make it through the whole process.
Sean
-----
Heart Mountain Herps