Keeping 2 female bearded dragons together

Question
I am wondering if it is okay to keep 2 female bearded dragons together as long as i get them the same in size. I have researched alot about the species but cannot find if this will be okay?
I have a large terrarium, a 55 G.. and once they get to big for it i will definitely buy an even larger one, but
i am going to be getting them around 5-6 inches .. will the two females be okay together as long as the space is large enough?
Can you please give me any additional information you can think of regarding keeping the 2 female bearded dragons together.
Thank you so much!

Answer
 Baby girls will get along fine.  It's when they hit puberty that will tell you whether they will always get along.  Signs that they should be separated are:
 1) Fighting, of course!
 2) One getting larger than the other, means one girl is getting more food.
 3) Mating behaviour to start an infertile egging cycle.

The 55 will be fine for while they are young. Provide two equally nice basking spots.