Hello,
Some place non adhesive shelf liner underneath of the tiles so that they don't slip around.
The textured tiles are good & they help with keeping their nails filed down, too.
How is he doing today? That is great you are moving him into a 4x2x2 tank, I'm sure that
he will love that.
Be sure to post pictures of his new home, with him in it of course, so we can all see him.
Let us know how his tail is doing.
Tracie