I am no expert at caring for beardies but I recently had to bring Spike, my 8 month old dragon, to the vet so I thought I would let you know my story. He was displaying a lot of the same symptoms you described in your post. He was more lethargic than usual, staying away from the lights and a decrease in his bowel movements. Spike never did loose his appetite. I have done a ton of research (mainly on this site) and I thought I was taking exceptional care of my little guy. But come to find out, Spike was diagnosed with metabolic bone disease. Originally, the vet thought it was my
uvb light (Reptisun 10) was the cause. He gave me another uv lamp (a Phillips something or other), some liquid calcium and reglan to be given twice a day. I brought in a fecal today and he also has coccidia and bacteria. So it probably wasn't a lighting issue but probably the parasites and bacteria robbing him of his nutrients. So now he is also on some other meds for that. Let me tell you, it is not much fun trying to get these liquid meds in my dragon. He is stubborn and won't open his mouth. Lucky for him, I am way more stubborn and I kept at it until I figured out how to get the meds in him.
I looked at your pics (cute little guy) but I can't believe he is 9 months. My beardie is 8 months (my guess since we got him from a pet store (gasp!) Dec 28th and he was tiny). He is probably double the size of your dragon. Spike eats ALOT of crickets and phoenix worms, and a little greens (trying to work on that). In fact, he probably eats almost 50-100 a day. The girl at Petsmart implied that I am overfeeding him. I recently started ordering in bulk online from Pet Mountain. Anyways, at the vet, he told me dark leafy greens. No lettuce, cabbage or spinach. I see you feed your beardie Spring mix which I believe contains a lot of lettuce. At Walmart, they have a greens mix that contains collard, mustard and turnip? greens. I think you would be better off with that.
I (in my extremely novice opinion) believe it is the absence of
uvb light that is causing the problems. You can give your dragon all the calcium in the world but if he doesn't have the
uvb light, it will not be absorbed. Calcium needs Vitamin D in order to be absorbed. The uvb supplies the Vit D.
This site and the people on it are great. I originally bought Spike for my son for Christmas and didn't know much about dragons. I bought the bearded dragon set from Petsmart. After researching on this site, I found that it wasn't the best route and I have replaced just about everything that came with the original set. My son lost interest a couple weeks after getting him but I cannot bring myself to get rid of Spike. I can't believe I got so darn attached to a reptile!!
Anyway, the vet told me this condition is reversible. Hang in there and keep us posted on Mordici's progress.