You dont epoxy them in place or anything? One thing I'd really like to try is making a solid reef formation using something like BRS eco-rock, and glueing/epoxying the whole structure together right from the start. I only worry about not being able to move anything if the need arose...
I have recently begun epoxying the corals in place. Mostly my hands don't do the moving, gravity and tank organisms are more likely to move things than I am. I will admit though that my hands are in the tank a lot - wipe the glass, change filter floss, empty skimmer cup etc.