I have 20cm of substrate in my whole terrarium in which the plants are sdirectly planted just as most european keepers do it and we do normally not have this problem at all.
If that doesn´t help you might have to increase the D3 you give him.
As you probably know, they cannot use calcium if they do not have enough D3 so this may be another problem.
It sometimes takes 2-3 days for them to shed, the older they get the longer it usually takes.
Try not to spray him when he´s shedding cause this might make the skin sticky.
Normal mineral supplements contain not only calcium but also micronutrients, but mainly yes.
How about offering some smell pieces of cuttlebone in his cage that he can shoot if he feels like he needs to?
I don´t ;)
I mean there´s nothing wrong with doing things like this, i just think that the animal will become a "second choice" easily this way.
I´d always recommend to try and get what you want the most because then you´ll be really happy and uch more enthusiastic about the care.
That´s at...
How about thinking of an animal you´d like to keep first and THEN get a cage?
Just keeping a species because it fits the terrarium is not the right way in my opinion.
Wow that´s VERY green, wil be interesting to see if it turns out to be a female as it´s said that if they turn green for a certain time when they are young they most probably are females.
Which local is that?
Very beautiful anyway.