Are the tortoises don't poop apart from drinking time? Only they will poop when they drink water?

If we use the exo terra substrate (such as coco husk/forest bark), we just change whichever portion which is affected by poop?

For young tortoise, stepping on the substrate won't give them the sinking feeling? Or keeping on newspaper is OK as well?

This post has been edited by OhNooy: May 25 2015, 11:07 AM