Hi Guys!

Im new to crested geckos, and just got mine last Sunday. He is only 2 months old, about 2-3 grams (I will be getting a scale tomorrow to know for sure). My question is that:

I have a 18x18x24 and was wondering if you guys think it is appropriate to move him in there? I think he will love it, and have fun exploring, but unsure if he will get "lost" and unable to find food? Maybe i am overthinking.. Just worried because he is my first reptile(: He did eat a little pangea last night out of a water bottle cap and is pooping regularly.

And two, ive read that I shouldn't add substrate yet, but how many grams would he need to be before I add it in?

Thanks in advance!!