As far as substrate....

I was thinking, since sand is generally bad i was going to go with slate rocks/tile.

Im going to try and explain my idea, its not complicated but a little bit difficult to describe.

I was thinking about laying down a very very small amount of sand (calm down....hold on) and then laying down as much slate rock and or tile over it. A very small amount of sand MAY or may not be exposed. 98% of the ground will be covered with slate rock with maybe only the corners or small spaces where the slate rock meets having sand exposed....im going to post a picture to better illustrate my idea.

My main goal is to create a safe, functional yet decorative display for these gecko's.

Im thinkin these guys will end up on paper towels anyway and since it will be a month or two before i aquire them, im playing with a few ideas and trouble shooting now as opposed to later.

My dad is an expert Tile-er so i'm sure i can rig something up myself.