I agree with not moving.
But not "The products of photosynthesis are shared throughout the coral." I have some corals that seem to shade out the bottom as the top portions grow. Most noticible in Pocillopora sp., not really evident in Acros. Does anyone cut off the bottom pieces before they fade for frags, leave them until they fade and then cut, or just leave 'em be?
Sorry to hijack but seems to be on topic atleast.