I hope this doesnt sound like i'm having a go, I think your in the US because you measured your viv in gallons and not feet but its 4.30am here and I need my bed so i'm just going to get strait to the point.
- UV light should be a minimum 10% UV output (preferably 12%). It should stretch most of the length of the viv starting in the hot end and leaving the cool end without. (if your viv is 4ft, you need a 3ft UV tube minimum) Without this he wont be able to create calcium which he needs for his bones to grow. Imagine when you was a baby instead of having milk which is rich in calcium, you got water which isnt.. If you made it to adulthood you would have all kinds of problems with your bones. same goes for your beardie! (The best analogy I can think of at 4am)
My guessing is that he has been scratching at the glass etc because he is desperate to find the UV which he NEEDS! This needs sorting ASAP and should be top priority!! I know you said the powersun is supposed to provide sufficiant UVb but I can assure you it doesnt. The people who make products like this put pictures of beardies on there packaging so then it sells, for some reason this isnt against advertising standards! Also.. Pet shops will sell it and tell you its ok becasue either a) they have a lack of knowledge or b) because they know that when you find out its not sufficiant you go back to them and spend more money in their store. Either way, its not enough!
- Your temps should be measured at 3 points in the viv using degital thermometers. One against the very end of the viv in the cool end, the other against very end of the viv in the warm end and the the third at the highest point of the basking spot under the lamp. They should read: Basking 39-43C, warm 29-35C and cool 23-28C. The basking spot and the cool end temps are the most important because he needs it hot enough so that he can digest his food (without this it will rot in his stomach) and cool enough because he has no other way to cool down. The temps in between should enable him to regulate his own temperature accordingly (thermoregulation..) Imagine if someone put you in a red hot room with no air con or fan and left you there forever. Not only would it be uncomfortable, but you would dehydrate as well. Same goes for your beardie :2thumb:
I dont know how long you have had him for but I recon if you sort these two things out then you will see a massive improvement in him! The UV needs sorting pretty much now anyway. Unless it is sorted it can lead to MBD, google MBD in reptiles and see what you can find.
Again sorry if it sounds like i'm being a bit shitty but I came on here, saw this and thought I had to comment! Hope it all works out for you if you have any more questions ask and someone will be glad to help : victory: