I would remove the Zoo Med Eco Earth Loose Coconut Fiber Substrate now, so he can continue to adjust to his new enclosure.
Cham's don't like changes.
Your best bet is to be sure that you follow the temperature, humidity and feeding guidelines that you will find here
https://www.chameleonforums.com/care/caresheets/veiled/, rather than trusting in the instructions given to you by someone in a petstore where even they don't know what the chams need.
You'll notice the temperatures are a little lower for the juveniles and babies than for older chams.
The Resources section of the forum has many other pages with plenty of truly necessary info.
You will have a healthier and longer lived cham if you make sure that the food he eats is as packed with nutrients as possible--not just by dusting lightly with supplements--which are necessary but by feeding the feeders a very nutritious diet, called gutloading.
More on that here
https://www.chameleonforums.com/care/food/
While he is growing, he's hungry like a teenager and if he isn't fed enough nutritious food he won't grow the way he should.
You can order different feeders from various places to add variety to his diet, which also is a part of good nutrition.
One good place is this one
http://www.mantidpets.com/shop/page/2?sessid=3KXCZDnyYC0HOWvi4DzN4R5XL1WtIhkc3FXlNq7rKdfRKvTLdvMmjwr9eQ2O6z9n&shop_param=