Hi there, a 24" uvb tube will be fine. Mount it near the basking heat bulb so your dragon will be close to it for a good portion of the day. You could also go with a longer one .
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!