Ah thank you all for the replies
He just had his first shed and it was a perfect shed. And those marks still stayed just got a little more noticeable after the shed. I'll definitely keep an eye on it but I wanted to ask experienced owners before I start getting worried. I'll give an update in about a month to see everyone thoughts about it again.
He doesn't really lay on anything, just in his hide then he comes out a night and hangs on a vine a few times and comes back down and lays there until the morning time and then goes back in his hide
For heating I have an under tank heater and a 40w red light.
Also another question, what's the general consensus regarding rats vs mice as feeders. Is there a definite nutritional difference between the two? I would like to start him on rats - he shows interest but doesn't budge probably because it's still a little big I'm guessing. So for now he just has large mice.