Bone Disease?

[Pookie]

About a month ago, my 5 month old Cham was acting a bit odd. He seemed weak and was wondering along the bottom of the cage more. The breeder i got him from said it might be metabolic bone disease..or something like that. So i increased the calcium in his diet and hot a mercury vapor light. He seems to be doing a lot better and he's climbing the branches now. Do you think i did everything that i should or is there more i should be doing?