What sex are they? I kept beardies very expensive business, we had a very large male and introduced a female the enclosure does have to be quite large so they get alot of space from each other, our vivarium was 4 1/2 feet long, and we had lots of little hides and tall branches in there. to start with there was alot of tail flicking and bobbing of the heads and wavin to start with , but they got on ok (36 eggs) we had males often fight so be cautious when doing this, Do you let them out on the floor together? Try them out of there enclosure to see what they do.
Mating is quite violent as well so dont get mixed up between the two.
good luck