[cypher]

What are you feeding him now? I can't remember which mixes you can get where you are.
His coat does look thin in places, make sure he's getting enough protein, his mix needs to be around 18-19% protein if it's less then you need to supplement it with things like chicken (just plain cooked or dried) mealworms, a little cooked egg, tofu, some extra nuts & seeds would be good to, flax seeds can be very good for the skin & coat condition. Hemp seeds are good too for overall nutrition, just a few added to his mix if you can get them.
Can you get brewers yeast (sold either as a supplementary powder or tablets you can crush)? If you can a tiny bit of that sprinkled on his food would be good if he likes it, some do some don't.
Introduce him to fresh veg too, slowly though, just a little piece once every few days to begin with building up to daily, I would focus on green veg, broccoli, spinach, kale, things like that for now.
Hope that helps.