Yes, fish tanks are called reptile cages by pet stores!
Here's one type of reptile cage: http://www.reptilebasics.com/2x3-Cag...h-p-16286.html
You can see that there are huge differences in the design!
Moss is good. I use long fiber sphagnum moss like that kind that people who grow orchids use (it's an awesome type from Chile). Here's where I got mine: http://www.tropicalplantproducts.com...?productID=501
That kilo will last you long time!!!