most people say a full grown beardie needs a 4x2x2 so i would recomend a 2x1x1 until they get settled and they can get to their food easier. if you already have a 4x2x2 built or one similar in size you could use like some sort of barrier in the tank you already have so they can get used to the tank.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!