Some other things to add.
He's 850g
He's in a 10g tank.
He has grown so much in the last month that his hide is a bit small. I propped it up water bowl so he could fit. The only problem with it is, its not tall enough. I am having trouble finding one to accommodate his size without upgrading tank size. I might have to Macgyver something.
He's been very active in the last 2 weeks. Out of his hide, climbing up the side tank.
Could the spots be irritation from constant climbing? Is he stressed?