Once a condi finds a good hole in the rocks to plant its foot, it typically doesn't move. If it can't find a suitable hole, it will roam all over.
Condi's aren't white. They're tan with pinkish/purplish colors on their tentacles. The ones you see in the LFS that are white, have lost a great deal of their zooxanthellae (algae). When they recover, they will return to the tan color.